Merge faffc025cb into c47f08dc7f

2024-11-22 13:50:49 +01:00 · 2024-10-27 08:42:20 +00:00
43 changed files with 7005 additions and 12780 deletions
--- a/.cirrus.yml
+++ b/.cirrus.yml
@ -0,0 +1,23 @@
+# SPDX-FileCopyrightText: 2022 Winni Neessen <winni@neessen.dev>
+#
+# SPDX-License-Identifier: MIT
+
+freebsd_task:
+  name: FreeBSD
+
+  matrix:
+    - name: FreeBSD 13.3
+      freebsd_instance:
+        image_family: freebsd-13-3
+    - name: FreeBSD 14.0
+      freebsd_instance:
+        image_family: freebsd-14-0
+
+  env:
+    TEST_SKIP_SENDMAIL: 1
+
+  pkginstall_script:
+    - pkg install -y go
+
+  test_script:
+    - go test -race -cover -shuffle=on ./...
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@ -1,221 +0,0 @@
-# SPDX-FileCopyrightText: 2024 The go-mail Authors
-#
-# SPDX-License-Identifier: MIT
-
-name: CI
-
-permissions:
-  contents: read
-
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-    branches:
-      - main
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref_name }}
-
-jobs:
-    codecov:
-        name: Test with Codecov coverage (${{ matrix.os }} / ${{ matrix.go }})
-        runs-on: ${{ matrix.os }}
-        concurrency:
-            group: ci-codecov-${{ matrix.os }}-${{ matrix.go }}
-            cancel-in-progress: true
-        strategy:
-            matrix:
-                os: [ubuntu-latest]
-                go: ['1.23']
-        env:
-            PERFORM_ONLINE_TEST: ${{ vars.PERFORM_ONLINE_TEST }}
-            PERFORM_UNIX_OPEN_WRITE_TESTS: ${{ vars.PERFORM_UNIX_OPEN_WRITE_TESTS }}
-            PERFORM_SENDMAIL_TESTS: ${{ vars.PERFORM_SENDMAIL_TESTS }}
-            TEST_HOST: ${{ secrets.TEST_HOST }}
-            TEST_USER: ${{ secrets.TEST_USER }}
-            TEST_PASS: ${{ secrets.TEST_PASS }}
-        steps:
-            - name: Harden Runner
-              uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
-              with:
-                  egress-policy: audit
-            - name: Checkout Code
-              uses: actions/checkout@61b9e3751b92087fd0b06925ba6dd6314e06f089 # master
-            - name: Setup go
-              uses: actions/setup-go@41dfa10bad2bb2ae585af6ee5bb4d7d973ad74ed # v5.1.0
-              with:
-                  go-version: ${{ matrix.go }}
-                  check-latest: true
-            - name: Install sendmail
-              run: |
-                sudo apt-get -y update >/dev/null && sudo apt-get -y upgrade >/dev/null && sudo DEBIAN_FRONTEND=noninteractive apt-get -y install nullmailer >/dev/null && which sendmail
-            - name: Run go test
-              if: success()
-              run: |
-                go test -race -shuffle=on --coverprofile=coverage.coverprofile --covermode=atomic ./...
-            - name: Upload coverage to Codecov
-              if: success()
-              uses: codecov/codecov-action@b9fd7d16f6d7d1b5d2bec1a2887e65ceed900238 # v4.6.0
-              with:
-                  token: ${{ secrets.CODECOV_TOKEN }} # not required for public repos
-    lint:
-        name: golangci-lint (${{ matrix.go }})
-        runs-on: ubuntu-latest
-        concurrency:
-            group: ci-lint-${{ matrix.go }}
-            cancel-in-progress: true
-        strategy:
-            matrix:
-                go: ['1.23']
-        steps:
-            - name: Harden Runner
-              uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
-              with:
-                  egress-policy: audit
-            - name: Setup go
-              uses: actions/setup-go@41dfa10bad2bb2ae585af6ee5bb4d7d973ad74ed # v5.1.0
-              with:
-                  go-version: ${{ matrix.go }}
-                  check-latest: true
-            - name: Checkout Code
-              uses: actions/checkout@61b9e3751b92087fd0b06925ba6dd6314e06f089 # master
-            - name: golangci-lint
-              uses: golangci/golangci-lint-action@971e284b6050e8a5849b72094c50ab08da042db8 # v6.1.1
-              with:
-                  version: latest
-    dependency-review:
-        name: Dependency review
-        runs-on: ubuntu-latest
-        concurrency:
-            group: ci-dependency-review
-            cancel-in-progress: true
-        steps:
-            - name: Harden Runner
-              uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
-              with:
-                  egress-policy: audit
-            - name: Checkout Code
-              uses: actions/checkout@61b9e3751b92087fd0b06925ba6dd6314e06f089 # master
-            - name: 'Dependency Review'
-              uses: actions/dependency-review-action@4081bf99e2866ebe428fc0477b69eb4fcda7220a # v4.4.0
-              with:
-                  base-ref: ${{ github.event.pull_request.base.sha || 'main' }}
-                  head-ref: ${{ github.event.pull_request.head.sha || github.ref }}
-    govulncheck:
-        name: Go vulnerabilities check
-        runs-on: ubuntu-latest
-        concurrency:
-            group: ci-govulncheck
-            cancel-in-progress: true
-        steps:
-            - name: Harden Runner
-              uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
-              with:
-                  egress-policy: audit
-            - name: Run govulncheck
-              uses: golang/govulncheck-action@b625fbe08f3bccbe446d94fbf87fcc875a4f50ee # v1.0.4
-    test:
-        name: Test (${{ matrix.os }} / ${{ matrix.go }})
-        runs-on: ${{ matrix.os }}
-        concurrency:
-            group: ci-test-${{ matrix.os }}-${{ matrix.go }}
-            cancel-in-progress: true
-        strategy:
-            matrix:
-                os: [ubuntu-latest, macos-latest, windows-latest]
-                go: ['1.19', '1.20', '1.21', '1.22', '1.23']
-        steps:
-            - name: Harden Runner
-              uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
-              with:
-                  egress-policy: audit
-            - name: Checkout Code
-              uses: actions/checkout@61b9e3751b92087fd0b06925ba6dd6314e06f089 # master
-            - name: Setup go
-              uses: actions/setup-go@41dfa10bad2bb2ae585af6ee5bb4d7d973ad74ed # v5.1.0
-              with:
-                  go-version: ${{ matrix.go }}
-            - name: Run go test
-              run: |
-                go test -race -shuffle=on ./...
-    test-fbsd:
-        name: Test on FreeBSD ${{ matrix.osver }}
-        runs-on: ubuntu-latest
-        concurrency:
-            group: ci-test-freebsd-${{ matrix.osver }}
-            cancel-in-progress: true
-        strategy:
-            matrix:
-                osver: ['14.1', '14.0', 13.4']
-        steps:
-            - name: Checkout Code
-              uses: actions/checkout@61b9e3751b92087fd0b06925ba6dd6314e06f089 # master
-            - name: Run go test on FreeBSD
-              uses: vmactions/freebsd-vm@v1
-              with:
-                  usesh: true
-                  copyback: false
-                  prepare: |
-                    pkg install -y go
-                  run: |
-                    cd $GITHUB_WORKSPACE;
-                    go test -race -shuffle=on ./...
-    reuse:
-        name: REUSE Compliance Check
-        runs-on: ubuntu-latest
-        concurrency:
-            group: ci-reuse
-            cancel-in-progress: true
-        steps:
-            - name: Harden Runner
-              uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
-              with:
-                  egress-policy: audit
-            - name: Checkout Code
-              uses: actions/checkout@61b9e3751b92087fd0b06925ba6dd6314e06f089 # master
-            - name: REUSE Compliance Check
-              uses: fsfe/reuse-action@3ae3c6bdf1257ab19397fab11fd3312144692083 # v4.0.0
-    sonarqube:
-        name: Test with SonarQube review (${{ matrix.os }} / ${{ matrix.go }})
-        runs-on: ${{ matrix.os }}
-        concurrency:
-            group: ci-codecov-${{ matrix.go }}
-            cancel-in-progress: true
-        strategy:
-            matrix:
-                os: [ubuntu-latest]
-                go: ['1.23']
-        env:
-            PERFORM_ONLINE_TEST: ${{ vars.PERFORM_ONLINE_TEST }}
-            TEST_HOST: ${{ secrets.TEST_HOST }}
-            TEST_USER: ${{ secrets.TEST_USER }}
-            TEST_PASS: ${{ secrets.TEST_PASS }}
-        steps:
-            - name: Harden Runner
-              uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
-              with:
-                  egress-policy: audit
-            - name: Checkout Code
-              uses: actions/checkout@61b9e3751b92087fd0b06925ba6dd6314e06f089 # master
-            - name: Setup go
-              uses: actions/setup-go@41dfa10bad2bb2ae585af6ee5bb4d7d973ad74ed # v5.1.0
-              with:
-                  go-version: ${{ matrix.go }}
-                  check-latest: true
-            - name: Run go test
-              run: |
-                go test -shuffle=on -race --coverprofile=./cov.out ./...
-            - name: SonarQube scan
-              uses: sonarsource/sonarqube-scan-action@884b79409bbd464b2a59edc326a4b77dc56b2195 # master
-              if: success()
-              env:
-                  SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
-                  SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }}
-            - name: SonarQube quality gate
-              uses: sonarsource/sonarqube-quality-gate-action@8406f4f1edaffef38e9fb9c53eb292fc1d7684fa # master
-              timeout-minutes: 5
-              env:
-                  SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
-                  SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }}
--- a/.github/workflows/codecov.yml
+++ b/.github/workflows/codecov.yml
@ -0,0 +1,67 @@
+# SPDX-FileCopyrightText: 2022 Winni Neessen <winni@neessen.dev>
+#
+# SPDX-License-Identifier: CC0-1.0
+
+name: Codecov workflow
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - '**.go'
+      - 'go.*'
+      - '.github/workflows/codecov.yml'
+      - 'codecov.yml'
+  pull_request:
+    branches:
+      - main
+    paths:
+      - '**.go'
+      - 'go.*'
+      - '.github/workflows/codecov.yml'
+      - 'codecov.yml'
+env:
+  TEST_HOST: ${{ secrets.TEST_HOST }}
+  TEST_FROM: ${{ secrets.TEST_USER }}
+  TEST_ALLOW_SEND: "1"
+  TEST_SMTPAUTH_USER: ${{ secrets.TEST_USER }}
+  TEST_SMTPAUTH_PASS: ${{ secrets.TEST_PASS }}
+  TEST_SMTPAUTH_TYPE: "LOGIN"
+  TEST_ONLINE_SCRAM: "1"
+  TEST_HOST_SCRAM: ${{ secrets.TEST_HOST_SCRAM }}
+  TEST_USER_SCRAM: ${{ secrets.TEST_USER_SCRAM }}
+  TEST_PASS_SCRAM: ${{ secrets.TEST_PASS_SCRAM }}
+permissions:
+  contents: read
+
+jobs:
+  run:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        go: ['1.23']
+    steps:
+    - name: Harden Runner
+      uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
+      with:
+        egress-policy: audit
+
+    - name: Checkout Code
+      uses: actions/checkout@61b9e3751b92087fd0b06925ba6dd6314e06f089 # master
+    - name: Setup go
+      uses: actions/setup-go@41dfa10bad2bb2ae585af6ee5bb4d7d973ad74ed # v5.1.0
+      with:
+        go-version: ${{ matrix.go }}
+    - name: Install sendmail
+      if: matrix.go == '1.23' && matrix.os == 'ubuntu-latest'
+      run: |
+        sudo apt-get -y install sendmail; which sendmail
+    - name: Run Tests
+      run: |
+        go test -race --coverprofile=coverage.coverprofile --covermode=atomic ./...
+    - name: Upload coverage to Codecov
+      if: success() && matrix.go == '1.23' && matrix.os == 'ubuntu-latest'
+      uses: codecov/codecov-action@b9fd7d16f6d7d1b5d2bec1a2887e65ceed900238 # v4.6.0
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }} # not required for public repos
--- a/.github/workflows/dependency-review.yml
+++ b/.github/workflows/dependency-review.yml
@ -0,0 +1,31 @@
+# SPDX-FileCopyrightText: 2022-2023 The go-mail Authors
+#
+# SPDX-License-Identifier: CC0-1.0
+
+# Dependency Review Action
+#
+# This Action will scan dependency manifest files that change as part of a Pull Request,
+# surfacing known-vulnerable versions of the packages declared or updated in the PR.
+# Once installed, if the workflow run is marked as required,
+# PRs introducing known-vulnerable packages will be blocked from merging.
+#
+# Source repository: https://github.com/actions/dependency-review-action
+name: 'Dependency Review'
+on: [pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  dependency-review:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
+        with:
+          egress-policy: audit
+
+      - name: 'Checkout Repository'
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+      - name: 'Dependency Review'
+        uses: actions/dependency-review-action@a6993e2c61fd5dc440b409aa1d6904921c5e1894 # v4.3.5
--- a/.github/workflows/golangci-lint.yml
+++ b/.github/workflows/golangci-lint.yml
@ -0,0 +1,54 @@
+# SPDX-FileCopyrightText: 2022 Winni Neessen <winni@neessen.dev>
+#
+# SPDX-License-Identifier: CC0-1.0
+
+name: golangci-lint
+on:
+  push:
+    tags:
+      - v*
+    branches:
+      - main
+  pull_request:
+permissions:
+  contents: read
+  # Optional: allow read access to pull request. Use with `only-new-issues` option.
+  # pull-requests: read
+jobs:
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
+        with:
+          egress-policy: audit
+
+      - uses: actions/setup-go@41dfa10bad2bb2ae585af6ee5bb4d7d973ad74ed # v5.1.0
+        with:
+          go-version: '1.23'
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@971e284b6050e8a5849b72094c50ab08da042db8 # v6.1.1
+        with:
+          # Optional: version of golangci-lint to use in form of v1.2 or v1.2.3 or `latest` to use the latest version
+          version: latest
+
+          # Optional: working directory, useful for monorepos
+          # working-directory: somedir
+
+          # Optional: golangci-lint command line arguments.
+          # args: --issues-exit-code=0
+
+          # Optional: show only new issues if it's a pull request. The default value is `false`.
+          # only-new-issues: true
+
+          # Optional: if set to true then the all caching functionality will be complete disabled,
+          #           takes precedence over all other caching options.
+          # skip-cache: true
+
+          # Optional: if set to true then the action don't cache or restore ~/go/pkg.
+          # skip-pkg-cache: true
+
+          # Optional: if set to true then the action don't cache or restore ~/.cache/go-build.
+          # skip-build-cache: true
--- a/.github/workflows/govulncheck.yml
+++ b/.github/workflows/govulncheck.yml
@ -0,0 +1,21 @@
+# SPDX-FileCopyrightText: 2022 Winni Neessen <winni@neessen.dev>
+#
+# SPDX-License-Identifier: CC0-1.0
+
+name: Govulncheck Security Scan
+
+on: [push, pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps: 
+    - name: Harden Runner
+      uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
+      with:
+        egress-policy: audit
+    - name: Run govulncheck
+      uses: golang/govulncheck-action@b625fbe08f3bccbe446d94fbf87fcc875a4f50ee # v1.0.4
--- a/.github/workflows/offline-tests.yml
+++ b/.github/workflows/offline-tests.yml
@ -0,0 +1,45 @@
+# SPDX-FileCopyrightText: 2022 Winni Neessen <winni@neessen.dev>
+#
+# SPDX-License-Identifier: CC0-1.0
+
+name: Offline tests workflow
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - '**.go'
+      - 'go.*'
+      - '.github/workflows/offline-tests.yml'
+  pull_request:
+    branches:
+      - main
+    paths:
+      - '**.go'
+      - 'go.*'
+      - '.github/workflows/offline-tests.yml'
+permissions:
+  contents: read
+
+jobs:
+  run:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        go: ['1.19', '1.20', '1.21', '1.22', '1.23']
+    steps:
+    - name: Harden Runner
+      uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
+      with:
+        egress-policy: audit
+
+    - name: Checkout Code
+      uses: actions/checkout@61b9e3751b92087fd0b06925ba6dd6314e06f089 # master
+    - name: Setup go
+      uses: actions/setup-go@41dfa10bad2bb2ae585af6ee5bb4d7d973ad74ed # v5.1.0
+      with:
+        go-version: ${{ matrix.go }}
+    - name: Run Tests
+      run: |
+        go test -race -shuffle=on ./...
--- a/.github/workflows/reuse.yml
+++ b/.github/workflows/reuse.yml
@ -0,0 +1,23 @@
+# SPDX-FileCopyrightText: 2022 Winni Neessen <winni@neessen.dev>
+#
+# SPDX-License-Identifier: CC0-1.0
+
+name: REUSE Compliance Check
+
+on: [push, pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps: 
+    - name: Harden Runner
+      uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
+      with:
+        egress-policy: audit
+
+    - uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2.7.0
+    - name: REUSE Compliance Check
+      uses: fsfe/reuse-action@3ae3c6bdf1257ab19397fab11fd3312144692083 # v4.0.0
--- a/.github/workflows/sonarqube.yml
+++ b/.github/workflows/sonarqube.yml
@ -0,0 +1,56 @@
+# SPDX-FileCopyrightText: 2022 Winni Neessen <winni@neessen.dev>
+#
+# SPDX-License-Identifier: CC0-1.0
+
+name: SonarQube
+
+permissions:
+  contents: read
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - '**.go'
+      - 'go.*'
+      - '.github/workflows/sonarqube.yml'
+  pull_request:
+    branches:
+      - main
+    paths:
+      - '**.go'
+      - 'go.*'
+      - '.github/workflows/sonarqube.yml'
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
+        with:
+          egress-policy: audit
+
+      - uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2.7.0
+        with:
+          fetch-depth: 0
+          
+      - name: Setup Go
+        uses: actions/setup-go@41dfa10bad2bb2ae585af6ee5bb4d7d973ad74ed # v5.1.0
+        with:
+          go-version: '1.23'
+          
+      - name: Run unit Tests
+        run: |
+          go test -shuffle=on -race --coverprofile=./cov.out ./...
+
+      - uses: sonarsource/sonarqube-scan-action@884b79409bbd464b2a59edc326a4b77dc56b2195 # master
+        env:
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+          SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }}
+          
+      - uses: sonarsource/sonarqube-quality-gate-action@dc2f7b0dd95544cd550de3028f89193576e958b9 # master
+        timeout-minutes: 5
+        env:
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
--- a/.gitignore
+++ b/.gitignore
@ -56,6 +56,4 @@ crashlytics.properties
 crashlytics-build.properties
 fabric.properties

-## Coverage data
-coverage.coverprofile
-coverage.html
+testdata
--- a/b64linebreaker.go
+++ b/b64linebreaker.go
@ -13,8 +13,8 @@ import (
 // in encoding processes.
 var newlineBytes = []byte(SingleNewLine)

-// ErrNoOutWriter is the error returned when no io.Writer is set for Base64LineBreaker.
-var ErrNoOutWriter = errors.New("no io.Writer set for Base64LineBreaker")
+// ErrNoOutWriter is the error message returned when no io.Writer is set for Base64LineBreaker.
+const ErrNoOutWriter = "no io.Writer set for Base64LineBreaker"

 // Base64LineBreaker handles base64 encoding with the insertion of new lines after a certain number
 // of characters.
@ -44,7 +44,7 @@ type Base64LineBreaker struct {
 //   - err: An error if one occurred during the write operation.
 func (l *Base64LineBreaker) Write(data []byte) (numBytes int, err error) {
 	if l.out == nil {
-		err = ErrNoOutWriter
+		err = errors.New(ErrNoOutWriter)
 		return
 	}
 	if l.used+len(data) < MaxBodyLength {
--- a/b64linebreaker_test.go
+++ b/b64linebreaker_test.go
@ -5,165 +5,487 @@
 package mail

 import (
+	"bufio"
 	"bytes"
 	"encoding/base64"
 	"errors"
+	"fmt"
 	"io"
 	"os"
 	"testing"
 )

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+`
+
 var (
-	errClosedWriter = errors.New("writer is already closed")
-	errMockDefault  = errors.New("mock write error")
-	errMockNewline  = errors.New("mock newline error")
+	errMockDefault = errors.New("mock write error")
+	errMockNewline = errors.New("mock newline error")
 )

+// TestBase64LineBreaker tests the Write and Close methods of the Base64LineBreaker
 func TestBase64LineBreaker(t *testing.T) {
-	t.Run("write, copy and close", func(t *testing.T) {
-		logoWriter := bytes.NewBuffer(nil)
-		lineBreaker := &Base64LineBreaker{out: logoWriter}
-		t.Cleanup(func() {
-			if err := lineBreaker.Close(); err != nil {
-				t.Errorf("failed to close line breaker: %s", err)
-			}
-		})
-		if _, err := lineBreaker.Write([]byte("testdata")); err != nil {
-			t.Errorf("failed to write to line breaker: %s", err)
-		}
-	})
-	t.Run("write actual data and compare with expected results", func(t *testing.T) {
-		logo, err := os.Open("testdata/logo.svg")
-		if err != nil {
-			t.Fatalf("failed to open test data file: %s", err)
-		}
-		t.Cleanup(func() {
-			if err := logo.Close(); err != nil {
-				t.Errorf("failed to close test data file: %s", err)
-			}
-		})
+	l, err := os.Open("assets/gopher2.svg")
+	if err != nil {
+		t.Errorf("failed to open gopher logo asset: %s", err)
+		return
+	}
+	defer func() { _ = l.Close() }()

-		logoWriter := bytes.NewBuffer(nil)
-		lineBreaker := &Base64LineBreaker{out: logoWriter}
-		t.Cleanup(func() {
-			if err := lineBreaker.Close(); err != nil {
-				t.Errorf("failed to close line breaker: %s", err)
-			}
-		})
-		base64Encoder := base64.NewEncoder(base64.StdEncoding, lineBreaker)
-		t.Cleanup(func() {
-			if err := base64Encoder.Close(); err != nil {
-				t.Errorf("failed to close base64 encoder: %s", err)
-			}
-		})
-		copiedBytes, err := io.Copy(base64Encoder, logo)
-		if err != nil {
-			t.Errorf("failed to copy test data to line breaker: %s", err)
-		}
-		if err = base64Encoder.Close(); err != nil {
-			t.Errorf("failed to close base64 encoder: %s", err)
-		}
-		if err = lineBreaker.Close(); err != nil {
-			t.Errorf("failed to close line breaker: %s", err)
-		}
-
-		logoStat, err := os.Stat("testdata/logo.svg")
-		if err != nil {
-			t.Fatalf("failed to stat test data file: %s", err)
-		}
-		if logoStat.Size() != copiedBytes {
-			t.Errorf("copied %d bytes, but expected %d bytes", copiedBytes, logoStat.Size())
-		}
-
-		expectedRaw, err := os.ReadFile("testdata/logo.svg.base64")
-		if err != nil {
-			t.Errorf("failed to read expected base64 data from file: %s", err)
-		}
-		expected := removeNewLines(t, expectedRaw)
-		got := removeNewLines(t, logoWriter.Bytes())
-		if !bytes.EqualFold(expected, got) {
-			t.Errorf("generated line breaker output differs from expected data")
-		}
-	})
-	t.Run("fail with no writer defined", func(t *testing.T) {
-		lineBreaker := &Base64LineBreaker{}
-		_, err := lineBreaker.Write([]byte("testdata"))
-		if err == nil {
-			t.Errorf("writing to Base64LineBreaker with no output io.Writer was supposed to failed, but didn't")
-		}
-		if !errors.Is(err, ErrNoOutWriter) {
-			t.Errorf("unexpected error while writing to empty Base64LineBreaker: %s", err)
-		}
-		if err := lineBreaker.Close(); err != nil {
-			t.Errorf("failed to close Base64LineBreaker: %s", err)
-		}
-	})
-	t.Run("write on an already closed output writer", func(t *testing.T) {
-		logo, err := os.Open("testdata/logo.svg")
-		if err != nil {
-			t.Fatalf("failed to open test data file: %s", err)
-		}
-		t.Cleanup(func() {
-			if err := logo.Close(); err != nil {
-				t.Errorf("failed to close test data file: %s", err)
-			}
-		})
-
-		writeBuffer := &errorWriter{}
-		lineBreaker := &Base64LineBreaker{out: writeBuffer}
-		_, err = io.Copy(lineBreaker, logo)
-		if err == nil {
-			t.Errorf("writing to Base64LineBreaker with an already closed output io.Writer was " +
-				"supposed to failed, but didn't")
-		}
-		if !errors.Is(err, errClosedWriter) {
-			t.Errorf("unexpected error while writing to Base64LineBreaker: %s", err)
-		}
-	})
-	t.Run("fail on different scenarios with mock writer", func(t *testing.T) {
-		tests := []struct {
-			name   string
-			data   []byte
-			writer io.Writer
-		}{
-			{
-				name:   "write data within MaxBodyLength",
-				data:   []byte("testdata"),
-				writer: &mockWriterExcess{writeError: errMockDefault},
-			},
-			{
-				name: "write data exceeds MaxBodyLength",
-				data: []byte("verylongtestdataverylongtestdataverylongtestdata" +
-					"verylongtestdataverylongtestdataverylongtestdata"),
-				writer: &mockWriterExcess{writeError: errMockDefault},
-			},
-			{
-				name: "write data exceeds MaxBodyLength with newline",
-				data: []byte("verylongtestdataverylongtestdataverylongtestdata" +
-					"verylongtestdataverylongtestdataverylongtestdata"),
-				writer: &mockWriterNewline{writeError: errMockDefault},
-			},
-		}
-		for _, tt := range tests {
-			t.Run(tt.name, func(t *testing.T) {
-				lineBreaker := &Base64LineBreaker{out: tt.writer}
-
-				_, err := lineBreaker.Write(tt.data)
-				if err != nil && !errors.Is(err, errMockDefault) && !errors.Is(err, errMockNewline) {
-					t.Errorf("unexpected error while writing to mock writer: %s", err)
-				}
-				err = lineBreaker.Close()
-				if err != nil && !errors.Is(err, errMockDefault) && !errors.Is(err, errMockNewline) {
-					t.Errorf("unexpected error while closing mock writer: %s", err)
-				}
-			})
-		}
-	})
+	var wbuf bytes.Buffer
+	lb := Base64LineBreaker{out: &wbuf}
+	bw := base64.NewEncoder(base64.StdEncoding, &lb)
+	if _, err := io.Copy(bw, l); err != nil {
+		t.Errorf("failed to write logo asset to line breaker: %s", err)
+		return
+	}
+	if err := bw.Close(); err != nil {
+		t.Errorf("failed to close b64 encoder: %s", err)
+	}
+	if err := lb.Close(); err != nil {
+		t.Errorf("failed to close line breaker: %s", err)
+	}
+	ob := removeNewLines([]byte(logoB64))
+	nb := removeNewLines(wbuf.Bytes())
+	if string(ob) != string(nb) {
+		t.Errorf("generated line breaker output differs from original data")
+	}
 }

-// removeNewLines is a test helper thatremoves all newline characters ('\r' and '\n') from the given byte slice.
-func removeNewLines(t *testing.T, data []byte) []byte {
-	t.Helper()
+// TestBase64LineBreakerFailures tests the cases in which the Base64LineBreaker would fail
+func TestBase64LineBreakerFailures(t *testing.T) {
+	stt := []byte("short")
+	ltt := []byte(logoB64)
+
+	// No output writer defined
+	lb := Base64LineBreaker{}
+	if _, err := lb.Write(stt); err == nil {
+		t.Errorf("writing to Base64LineBreaker with no output io.Writer was supposed to failed, but didn't")
+	}
+	if err := lb.Close(); err != nil {
+		t.Errorf("failed to close Base64LineBreaker: %s", err)
+	}
+
+	// Closed output writer
+	wbuf := errorWriter{}
+	fb := Base64LineBreaker{out: wbuf}
+	if _, err := fb.Write(ltt); err == nil {
+		t.Errorf("writing to Base64LineBreaker with errorWriter was supposed to failed, but didn't")
+	}
+	if err := fb.Close(); err != nil {
+		t.Errorf("failed to close Base64LineBreaker: %s", err)
+	}
+}
+
+func TestBase64LineBreaker_WriteAndClose(t *testing.T) {
+	tests := []struct {
+		name   string
+		data   []byte
+		writer io.Writer
+	}{
+		{
+			name:   "Write data within MaxBodyLength",
+			data:   []byte("testdata"),
+			writer: &mockWriterExcess{writeError: errMockDefault},
+		},
+		{
+			name: "Write data exceeds MaxBodyLength",
+			data: []byte("verylongtestdataverylongtestdataverylongtestdata" +
+				"verylongtestdataverylongtestdataverylongtestdata"),
+			writer: &mockWriterExcess{writeError: errMockDefault},
+		},
+		{
+			name: "Write data exceeds MaxBodyLength with newline",
+			data: []byte("verylongtestdataverylongtestdataverylongtestdata" +
+				"verylongtestdataverylongtestdataverylongtestdata"),
+			writer: &mockWriterNewline{writeError: errMockDefault},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			blr := &Base64LineBreaker{out: tt.writer}
+
+			_, err := blr.Write(tt.data)
+			if err != nil && !errors.Is(err, errMockDefault) && !errors.Is(err, errMockNewline) {
+				t.Errorf("Unexpected error while writing: %v", err)
+			}
+			err = blr.Close()
+			if err != nil && !errors.Is(err, errMockDefault) && !errors.Is(err, errMockNewline) {
+				t.Errorf("Unexpected error while closing: %v", err)
+			}
+		})
+	}
+}
+
+// removeNewLines removes any newline characters from the given data
+func removeNewLines(data []byte) []byte {
 	result := make([]byte, len(data))
 	n := 0

@ -181,11 +503,11 @@ func removeNewLines(t *testing.T, data []byte) []byte {
 type errorWriter struct{}

 func (e errorWriter) Write([]byte) (int, error) {
-	return 0, errClosedWriter
+	return 0, fmt.Errorf("supposed to always fail")
 }

 func (e errorWriter) Close() error {
-	return errClosedWriter
+	return fmt.Errorf("supposed to always fail")
 }

 type mockWriterExcess struct {
@ -217,49 +539,19 @@ func (w *mockWriterNewline) Write(p []byte) (n int, err error) {
 	}
 }

-func FuzzBase64LineBreaker(f *testing.F) {
-	seedData := [][]byte{
-		[]byte(""),
-		[]byte("abc"),
-		[]byte("def"),
-		[]byte("Hello, World!"),
-		[]byte("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!§$%&/()=?`{[]}\\|^~*+#-._'"),
-		[]byte("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"),
-		bytes.Repeat([]byte("A"), MaxBodyLength-1),  // Near the line length limit
-		bytes.Repeat([]byte("A"), MaxBodyLength),    // Exactly the line length limit
-		bytes.Repeat([]byte("A"), MaxBodyLength+1),  // Slightly above the line length limit
-		bytes.Repeat([]byte("A"), MaxBodyLength*3),  // Tripple exceed the line length limit
-		bytes.Repeat([]byte("A"), MaxBodyLength*10), // Tenfold exceed the line length limit
-		{0o0, 0o1, 0o2, 30, 255},
-	}
-	for _, data := range seedData {
-		f.Add(data)
-	}
-
+func FuzzBase64LineBreaker_Write(f *testing.F) {
+	f.Add([]byte("abc"))
+	f.Add([]byte("def"))
+	f.Add([]uint8{0o0, 0o1, 0o2, 30, 255})
+	buf := bytes.Buffer{}
+	bw := bufio.NewWriter(&buf)
 	f.Fuzz(func(t *testing.T, data []byte) {
-		buffer := bytes.NewBuffer(nil)
-		lineBreaker := &Base64LineBreaker{
-			out: buffer,
+		b := &Base64LineBreaker{out: bw}
+		if _, err := b.Write(data); err != nil {
+			t.Errorf("failed to write to B64LineBreaker: %s", err)
 		}
-		base64Encoder := base64.NewEncoder(base64.StdEncoding, lineBreaker)
-
-		_, err := base64Encoder.Write(data)
-		if err != nil {
-			t.Errorf("failed to write test data to base64 encoder: %s", err)
-		}
-		if err = base64Encoder.Close(); err != nil {
-			t.Errorf("failed to close base64 encoder: %s", err)
-		}
-		if err = lineBreaker.Close(); err != nil {
-			t.Errorf("failed to close base64 line breaker: %s", err)
-		}
-
-		decode, err := base64.StdEncoding.DecodeString(buffer.String())
-		if err != nil {
-			t.Errorf("failed to decode base64 data: %s", err)
-		}
-		if !bytes.Equal(data, decode) {
-			t.Error("generated line breaker output differs from original data")
+		if err := b.Close(); err != nil {
+			t.Errorf("failed to close B64LineBreaker: %s", err)
 		}
 	})
 }
--- a/client.go
+++ b/client.go
@ -242,12 +242,6 @@ var (
 	// provided as argument to the WithDSN Option.
 	ErrInvalidDSNRcptNotifyCombination = errors.New("DSN rcpt notify option NEVER cannot be " +
 		"combined with any of SUCCESS, FAILURE or DELAY")
-
-	// ErrSMTPAuthMethodIsNil indicates that the SMTP authentication method provided is nil
-	ErrSMTPAuthMethodIsNil = errors.New("SMTP auth method is nil")
-
-	// ErrDialContextFuncIsNil indicates that a required dial context function is not provided.
-	ErrDialContextFuncIsNil = errors.New("dial context function is nil")
 )

 // NewClient creates a new Client instance with the provided host and optional configuration Option functions.
@ -516,9 +510,6 @@ func WithSMTPAuth(authtype SMTPAuthType) Option {
 //   - An Option function that sets the custom SMTP authentication for the Client.
 func WithSMTPAuthCustom(smtpAuth smtp.Auth) Option {
 	return func(c *Client) error {
-		if smtpAuth == nil {
-			return ErrSMTPAuthMethodIsNil
-		}
 		c.smtpAuth = smtpAuth
 		c.smtpAuthType = SMTPAuthCustom
 		return nil
@ -680,9 +671,6 @@ func WithoutNoop() Option {
 //   - An Option function that sets the custom DialContextFunc for the Client.
 func WithDialContextFunc(dialCtxFunc DialContextFunc) Option {
 	return func(c *Client) error {
-		if dialCtxFunc == nil {
-			return ErrDialContextFuncIsNil
-		}
 		c.dialContextFunc = dialCtxFunc
 		return nil
 	}
@ -751,7 +739,6 @@ func (c *Client) SetTLSPolicy(policy TLSPolicy) {
 func (c *Client) SetTLSPortPolicy(policy TLSPolicy) {
 	if c.port == DefaultPort {
 		c.port = DefaultPortTLS
-		c.fallbackPort = 0

 		if policy == TLSOpportunistic {
 			c.fallbackPort = DefaultPort
@ -1094,6 +1081,10 @@ func (c *Client) DialAndSendWithContext(ctx context.Context, messages ...*Msg) e
 //   - An error if the connection check fails, if no supported authentication method is found,
 //     or if the authentication process fails.
 func (c *Client) auth() error {
+	if err := c.checkConn(); err != nil {
+		return fmt.Errorf("failed to authenticate: %w", err)
+	}
+
 	if c.smtpAuth == nil && c.smtpAuthType != SMTPAuthNoAuth {
 		hasSMTPAuth, smtpAuthType := c.smtpClient.Extension("AUTH")
 		if !hasSMTPAuth {
@ -1261,13 +1252,14 @@ func (c *Client) sendSingleMsg(message *Msg) error {
 			affectedMsg: message,
 		}
 	}
+	message.isDelivered = true
+
 	if err = writer.Close(); err != nil {
 		return &SendError{
 			Reason: ErrSMTPDataClose, errlist: []error{err}, isTemp: isTempError(err),
 			affectedMsg: message,
 		}
 	}
-	message.isDelivered = true

 	if err = c.Reset(); err != nil {
 		return &SendError{
@ -1275,6 +1267,12 @@ func (c *Client) sendSingleMsg(message *Msg) error {
 			affectedMsg: message,
 		}
 	}
+	if err = c.checkConn(); err != nil {
+		return &SendError{
+			Reason: ErrConnCheck, errlist: []error{err}, isTemp: isTempError(err),
+			affectedMsg: message,
+		}
+	}
 	return nil
 }

@ -1291,9 +1289,6 @@ func (c *Client) sendSingleMsg(message *Msg) error {
 //   - An error if there is no active connection, if the NOOP command fails, or if extending
 //     the deadline fails; otherwise, returns nil.
 func (c *Client) checkConn() error {
-	if c.smtpClient == nil {
-		return ErrNoActiveConnection
-	}
 	if !c.smtpClient.HasConnection() {
 		return ErrNoActiveConnection
 	}
@ -1352,6 +1347,9 @@ func (c *Client) setDefaultHelo() error {
 //   - An error if there is no active connection, if STARTTLS is required but not supported,
 //     or if there are issues during the TLS handshake; otherwise, returns nil.
 func (c *Client) tls() error {
+	if !c.smtpClient.HasConnection() {
+		return ErrNoActiveConnection
+	}
 	if !c.useSSL && c.tlspolicy != NoTLS {
 		hasStartTLS := false
 		extension, _ := c.smtpClient.Extension("STARTTLS")
--- a/client_121_test.go
+++ b/client_121_test.go
@ -1,126 +0,0 @@
-// SPDX-FileCopyrightText: 2024 The go-mail Authors
-//
-// SPDX-License-Identifier: MIT
-
-//go:build go1.21
-// +build go1.21
-
-package mail
-
-import (
-	"bytes"
-	"context"
-	"errors"
-	"fmt"
-	"net"
-	"os"
-	"reflect"
-	"strings"
-	"testing"
-	"time"
-
-	"github.com/wneessen/go-mail/log"
-)
-
-func TestNewClientNewVersionsOnly(t *testing.T) {
-	tests := []struct {
-		name       string
-		option     Option
-		expectFunc func(c *Client) error
-		shouldfail bool
-		expectErr  *error
-	}{
-		{
-			"WithLogger log.JSONlog", WithLogger(log.NewJSON(os.Stderr, log.LevelDebug)),
-			func(c *Client) error {
-				if c.logger == nil {
-					return errors.New("failed to set logger. Want logger bug got got nil")
-				}
-				loggerType := reflect.TypeOf(c.logger).String()
-				if loggerType != "*log.JSONlog" {
-					return fmt.Errorf("failed to set logger. Want logger type: %s, got: %s",
-						"*log.JSONlog", loggerType)
-				}
-				return nil
-			},
-			false, nil,
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			client, err := NewClient(DefaultHost, tt.option)
-			if !tt.shouldfail && err != nil {
-				t.Fatalf("failed to create new client: %s", err)
-			}
-			if tt.shouldfail && err == nil {
-				t.Errorf("client creation was supposed to fail, but it didn't")
-			}
-			if tt.shouldfail && tt.expectErr != nil {
-				if !errors.Is(err, *tt.expectErr) {
-					t.Errorf("error for NewClient mismatch. Expected: %s, got: %s",
-						*tt.expectErr, err)
-				}
-			}
-			if tt.expectFunc != nil {
-				if err = tt.expectFunc(client); err != nil {
-					t.Errorf("NewClient with custom option failed: %s", err)
-				}
-			}
-		})
-	}
-}
-
-func TestClient_DialWithContextNewVersionsOnly(t *testing.T) {
-	ctx, cancel := context.WithCancel(context.Background())
-	defer cancel()
-	PortAdder.Add(1)
-	serverPort := int(TestServerPortBase + PortAdder.Load())
-	featureSet := "250-AUTH PLAIN\r\n250-8BITMIME\r\n250-DSN\r\n250 SMTPUTF8"
-	go func() {
-		if err := simpleSMTPServer(ctx, t, &serverProps{FeatureSet: featureSet, ListenPort: serverPort}); err != nil {
-			t.Errorf("failed to start test server: %s", err)
-			return
-		}
-	}()
-	time.Sleep(time.Millisecond * 30)
-	t.Run("connect with full debug logging and auth logging", func(t *testing.T) {
-		ctxDial, cancelDial := context.WithTimeout(ctx, time.Millisecond*500)
-		t.Cleanup(cancelDial)
-
-		logBuffer := bytes.NewBuffer(nil)
-		client, err := NewClient(DefaultHost, WithPort(serverPort), WithTLSPolicy(NoTLS),
-			WithDebugLog(), WithLogAuthData(), WithLogger(log.NewJSON(logBuffer, log.LevelDebug)),
-			WithSMTPAuth(SMTPAuthPlain), WithUsername("test"), WithPassword("password"))
-		if err != nil {
-			t.Fatalf("failed to create new client: %s", err)
-		}
-
-		if err = client.DialWithContext(ctxDial); err != nil {
-			var netErr net.Error
-			if errors.As(err, &netErr) && netErr.Timeout() {
-				t.Skip("failed to connect to the test server due to timeout")
-			}
-			t.Fatalf("failed to connect to the test server: %s", err)
-		}
-		t.Cleanup(func() {
-			if err = client.Close(); err != nil {
-				t.Errorf("failed to close the client: %s", err)
-			}
-		})
-
-		logs := parseJSONLog(t, logBuffer)
-		if len(logs.Lines) == 0 {
-			t.Errorf("failed to enable debug logging, but no logs were found")
-		}
-		authFound := false
-		for _, logline := range logs.Lines {
-			if strings.EqualFold(logline.Message, "AUTH PLAIN AHRlc3QAcGFzc3dvcmQ=") &&
-				logline.Direction.From == "client" && logline.Direction.To == "server" {
-				authFound = true
-			}
-		}
-		if !authFound {
-			t.Errorf("logAuthData not working, no authentication info found in logs")
-		}
-	})
-}
--- a/client_test.go
+++ b/client_test.go
--- a/codecov.yml
+++ b/codecov.yml
@ -6,17 +6,17 @@ coverage:
  status:
    project:
      default:
-        target: 90%
-        threshold: 2%
+        target: 85%
+        threshold: 5%
        base: auto 
        if_ci_failed: error
        only_pulls: false
    patch:
      default:
-        target: 90%
+        target: 80%
        base: auto
        if_ci_failed: error
-        threshold: 2%
+        threshold: 5%

 comment:
  require_changes: true
--- a/eml.go
+++ b/eml.go
@ -60,7 +60,7 @@ func EMLToMsgFromReader(reader io.Reader) (*Msg, error) {
 		return msg, fmt.Errorf("failed to parse EML from reader: %w", err)
 	}

-	if err = parseEML(parsedMsg, bodybuf, msg); err != nil {
+	if err := parseEML(parsedMsg, bodybuf, msg); err != nil {
 		return msg, fmt.Errorf("failed to parse EML contents: %w", err)
 	}

@ -93,7 +93,7 @@ func EMLToMsgFromFile(filePath string) (*Msg, error) {
 		return msg, fmt.Errorf("failed to parse EML file: %w", err)
 	}

-	if err = parseEML(parsedMsg, bodybuf, msg); err != nil {
+	if err := parseEML(parsedMsg, bodybuf, msg); err != nil {
 		return msg, fmt.Errorf("failed to parse EML contents: %w", err)
 	}

@ -218,9 +218,9 @@ func parseEMLHeaders(mailHeader *netmail.Header, msg *Msg) error {
 			for _, addr := range parsedAddrs {
 				addrStrings = append(addrStrings, addr.String())
 			}
-			// We can skip the error checking here since netmail.ParseAddressList already performed the
-			// same address checking that the msg methods do.
-			_ = addrFunc(addrStrings...)
+			if err = addrFunc(addrStrings...); err != nil {
+				return fmt.Errorf(`failed to parse %q header: %w`, addrHeader, err)
+			}
 		}
 	}

@ -600,8 +600,6 @@ func parseEMLAttachmentEmbed(contentDisposition []string, multiPart *multipart.P
 		if err := msg.EmbedReader(filename, dataReader); err != nil {
 			return fmt.Errorf("failed to embed multipart body: %w", err)
 		}
-	default:
-		return errors.New("unsupported content disposition type")
 	}
 	return nil
 }
--- a/eml_test.go
+++ b/eml_test.go
@ -6,8 +6,11 @@ package mail

 import (
 	"bytes"
+	"fmt"
+	"os"
 	"strings"
 	"testing"
+	"time"
 )

 const (
@ -19,23 +22,6 @@ Subject: Saying Hello
 Date: Fri, 21 Nov 1997 09:55:06 -0600
 Message-ID: <1234@local.machine.example>

-This is a message just to say hello.
-So, "Hello".`
-	exampleMailRFC5322A11InvalidFrom = `From: §§§§§§§§§
-To: Mary Smith <mary@example.net>
-Subject: Saying Hello
-Date: Fri, 21 Nov 1997 09:55:06 -0600
-Message-ID: <1234@local.machine.example>
-
-This is a message just to say hello.
-So, "Hello".`
-	exampleMailInvalidHeader = `From: John Doe <jdoe@machine.example>
-To: Mary Smith <mary@example.net>
-Inva@id*Header; This is a header
-Subject: Saying Hello
-Date: Fri, 21 Nov 1997 09:55:06 -0600
-Message-ID: <1234@local.machine.example>
-
 This is a message just to say hello.
 So, "Hello".`
 	exampleMailPlainNoEnc = `Date: Wed, 01 Nov 2023 00:00:00 +0000
@ -56,52 +42,6 @@ This is a test mail. Please do not reply to this. Also this line is very long so
 should be wrapped.


-Thank your for your business!
-The go-mail team
-
--
-This is a signature`
-	exampleMailPlainInvalidCTE = `Date: Wed, 01 Nov 2023 00:00:00 +0000
-MIME-Version: 1.0
-Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
-Subject: Example mail // plain text without encoding
-User-Agent: go-mail v0.4.0 // https://github.com/wneessen/go-mail
-X-Mailer: go-mail v0.4.0 // https://github.com/wneessen/go-mail
-From: "Toni Tester" <go-mail@go-mail.dev>
-To: <go-mail+test@go-mail.dev>
-Cc: <go-mail+cc@go-mail.dev>
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: invalid
-
-Dear Customer,
-
-This is a test mail. Please do not reply to this. Also this line is very long so it
-should be wrapped.
-
-
-Thank your for your business!
-The go-mail team
-
--
-This is a signature`
-	exampleMailInvalidContentType = `Date: Wed, 01 Nov 2023 00:00:00 +0000
-MIME-Version: 1.0
-Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
-Subject: Example mail // plain text without encoding
-User-Agent: go-mail v0.4.0 // https://github.com/wneessen/go-mail
-X-Mailer: go-mail v0.4.0 // https://github.com/wneessen/go-mail
-From: "Toni Tester" <go-mail@go-mail.dev>
-To: <go-mail+test@go-mail.dev>
-Cc: <go-mail+cc@go-mail.dev>
-Content-Type: text/plain @ charset=UTF-8; $foo; bar; --invalid--
-Content-Transfer-Encoding: 8bit
-
-Dear Customer,
-
-This is a test mail. Please do not reply to this. Also this line is very long so it
-should be wrapped.
-
-
 Thank your for your business!
 The go-mail team

@ -364,128 +304,6 @@ VGhpcyBpcyBhIHNpbXBsZSB0ZXN0IHRleHQgZmlsZSBhdHRhY2htZW50LgoKSXQgCiAgaGFzCiAg
 ICAgc2V2ZXJhbAogICAgICAgICAgICBuZXdsaW5lcwoJICAgICAgICAgICAgYW5kCgkgICAgc3Bh
 Y2VzCiAgICAgaW4KICBpdAouCgpBcyB3ZWxsIGFzIGFuIGVtb2ppOiDwn5mCCg==

--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7--`
-	exampleMailPlainB64WithAttachmentNoContentType = `Date: Wed, 01 Nov 2023 00:00:00 +0000
-MIME-Version: 1.0
-Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
-Subject: Example mail // plain text base64 with attachment
-User-Agent: go-mail v0.4.1 // https://github.com/wneessen/go-mail
-X-Mailer: go-mail v0.4.1 // https://github.com/wneessen/go-mail
-From: "Toni Tester" <go-mail@go-mail.dev>
-To: <go-mail+test@go-mail.dev>
-Cc: <go-mail+cc@go-mail.dev>
-Content-Type: multipart/mixed;
- boundary=45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7
-
--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7
-Content-Transfer-Encoding: base64
-
-RGVhciBDdXN0b21lciwKClRoaXMgaXMgYSB0ZXN0IG1haWwuIFBsZWFzZSBkbyBub3QgcmVwbHkg
-dG8gdGhpcy4gQWxzbyB0aGlzIGxpbmUgaXMgdmVyeSBsb25nIHNvIGl0CnNob3VsZCBiZSB3cmFw
-cGVkLgoKClRoYW5rIHlvdXIgZm9yIHlvdXIgYnVzaW5lc3MhClRoZSBnby1tYWlsIHRlYW0KCi0t
-ClRoaXMgaXMgYSBzaWduYXR1cmU=
-
--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7
-Content-Disposition: attachment; filename="test.attachment"
-Content-Transfer-Encoding: base64
-
-VGhpcyBpcyBhIHNpbXBsZSB0ZXN0IHRleHQgZmlsZSBhdHRhY2htZW50LgoKSXQgCiAgaGFzCiAg
-ICAgc2V2ZXJhbAogICAgICAgICAgICBuZXdsaW5lcwoJICAgICAgICAgICAgYW5kCgkgICAgc3Bh
-Y2VzCiAgICAgaW4KICBpdAouCgpBcyB3ZWxsIGFzIGFuIGVtb2ppOiDwn5mCCg==
-
--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7--`
-	exampleMailPlainB64WithAttachmentBrokenB64 = `Date: Wed, 01 Nov 2023 00:00:00 +0000
-MIME-Version: 1.0
-Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
-Subject: Example mail // plain text base64 with attachment
-User-Agent: go-mail v0.4.1 // https://github.com/wneessen/go-mail
-X-Mailer: go-mail v0.4.1 // https://github.com/wneessen/go-mail
-From: "Toni Tester" <go-mail@go-mail.dev>
-To: <go-mail+test@go-mail.dev>
-Cc: <go-mail+cc@go-mail.dev>
-Content-Type: multipart/mixed;
- boundary=45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7
-
--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7
-Content-Transfer-Encoding: base64
-Content-Type: text/plain; charset=UTF-8
-
-RGVhciBDdXN0b21lciwKClRoaXMgaXMgYSB0ZXN0IG1haWwuIFBsZWFzZSBkbyBub3QgcmVwbHkg
-dG8gdGhpcy4gQWxzbyB0aGl§§§§§@@@@@XMgdmVyeSBsb25nIHNvIGl0CnNob3VsZCBiZSB3cmFw
-cGVkLgoKClRoYW5rIHlvdXIgZm9yIHlvdXIgYnVzaW5lc3MhClRoZSBnby1tYWlsIHRlYW0KCi0t
-ClRoaXMgaXMgYSBzaWduYXR1cmU=
-
--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7
-Content-Disposition: attachment; filename="test.attachment"
-Content-Transfer-Encoding: base64
-Content-Type: application/octet-stream; name="test.attachment"
-
-VGhpcyBpcyBhIHNpbXBsZSB0ZXN0IHRleHQgZmlsZSBhdHRhY2htZW50LgoKSXQgCiAgaGFzCiAg
-ICAgc2V2ZXJhbAogICAg§§§§§@@@@@BuZXdsaW5lcwoJICAgICAgICAgICAgYW5kCgkgICAgc3Bh
-Y2VzCiAgICAgaW4KICBpdAouCgpBcyB3ZWxsIGFzIGFuIGVtb2ppOiDwn5mCCg==
-
--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7--`
-	exampleMailPlainB64WithAttachmentInvalidCTE = `Date: Wed, 01 Nov 2023 00:00:00 +0000
-MIME-Version: 1.0
-Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
-Subject: Example mail // plain text base64 with attachment
-User-Agent: go-mail v0.4.1 // https://github.com/wneessen/go-mail
-X-Mailer: go-mail v0.4.1 // https://github.com/wneessen/go-mail
-From: "Toni Tester" <go-mail@go-mail.dev>
-To: <go-mail+test@go-mail.dev>
-Cc: <go-mail+cc@go-mail.dev>
-Content-Type: multipart/mixed;
- boundary=45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7
-
--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7
-Content-Transfer-Encoding: invalid
-Content-Type: text/plain; charset=UTF-8
-
-RGVhciBDdXN0b21lciwKClRoaXMgaXMgYSB0ZXN0IG1haWwuIFBsZWFzZSBkbyBub3QgcmVwbHkg
-dG8gdGhpcy4gQWxzbyB0aGlzIGxpbmUgaXMgdmVyeSBsb25nIHNvIGl0CnNob3VsZCBiZSB3cmFw
-cGVkLgoKClRoYW5rIHlvdXIgZm9yIHlvdXIgYnVzaW5lc3MhClRoZSBnby1tYWlsIHRlYW0KCi0t
-ClRoaXMgaXMgYSBzaWduYXR1cmU=
-
--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7
-Content-Disposition: attachment; filename="test.attachment"
-Content-Transfer-Encoding: invalid
-Content-Type: application/octet-stream; name="test.attachment"
-
-VGhpcyBpcyBhIHNpbXBsZSB0ZXN0IHRleHQgZmlsZSBhdHRhY2htZW50LgoKSXQgCiAgaGFzCiAg
-ICAgc2V2ZXJhbAogICAgICAgICAgICBuZXdsaW5lcwoJICAgICAgICAgICAgYW5kCgkgICAgc3Bh
-Y2VzCiAgICAgaW4KICBpdAouCgpBcyB3ZWxsIGFzIGFuIGVtb2ppOiDwn5mCCg==
-
--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7--`
-	exampleMailPlainB64WithAttachmentInvalidContentType = `Date: Wed, 01 Nov 2023 00:00:00 +0000
-MIME-Version: 1.0
-Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
-Subject: Example mail // plain text base64 with attachment
-User-Agent: go-mail v0.4.1 // https://github.com/wneessen/go-mail
-X-Mailer: go-mail v0.4.1 // https://github.com/wneessen/go-mail
-From: "Toni Tester" <go-mail@go-mail.dev>
-To: <go-mail+test@go-mail.dev>
-Cc: <go-mail+cc@go-mail.dev>
-Content-Type: multipart/mixed;
- boundary=45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7
-
--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7
-Content-Transfer-Encoding: base64
-Content-Type: text/plain; charset=UTF-8
-
-RGVhciBDdXN0b21lciwKClRoaXMgaXMgYSB0ZXN0IG1haWwuIFBsZWFzZSBkbyBub3QgcmVwbHkg
-dG8gdGhpcy4gQWxzbyB0aGlzIGxpbmUgaXMgdmVyeSBsb25nIHNvIGl0CnNob3VsZCBiZSB3cmFw
-cGVkLgoKClRoYW5rIHlvdXIgZm9yIHlvdXIgYnVzaW5lc3MhClRoZSBnby1tYWlsIHRlYW0KCi0t
-ClRoaXMgaXMgYSBzaWduYXR1cmU=
-
--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7
-Content-Disposition: attachment; filename="test.attachment"
-Content-Transfer-Encoding: base64
-Content-Type; text/plain @ charset=UTF-8; $foo; bar; --invalid--
-
-VGhpcyBpcyBhIHNpbXBsZSB0ZXN0IHRleHQgZmlsZSBhdHRhY2htZW50LgoKSXQgCiAgaGFzCiAg
-ICAgc2V2ZXJhbAogICAgICAgICAgICBuZXdsaW5lcwoJICAgICAgICAgICAgYW5kCgkgICAgc3Bh
-Y2VzCiAgICAgaW4KICBpdAouCgpBcyB3ZWxsIGFzIGFuIGVtb2ppOiDwn5mCCg==
-
 --45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7--`
 	exampleMailPlainB64WithAttachmentNoBoundary = `Date: Wed, 01 Nov 2023 00:00:00 +0000
 MIME-Version: 1.0
@ -760,39 +578,6 @@ Content-Disposition: attachment;
 filename="testfile.txt"

 VGhpcyBpcyBhIHRlc3QgaW4gQmFzZTY0
--------------26A45336F6C6196BD8BBA2A2--`
-	exampleMultiPart7BitBase64BrokenB64 = `Date: Wed, 01 Nov 2023 00:00:00 +0000
-MIME-Version: 1.0
-Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
-Subject: Example mail // 7bit with base64 attachment
-User-Agent: go-mail v0.4.1 // https://github.com/wneessen/go-mail
-X-Mailer: go-mail v0.4.1 // https://github.com/wneessen/go-mail
-From: "Toni Tester" <go-mail@go-mail.dev>
-To: <go-mail+test@go-mail.dev>
-Cc: <go-mail+cc@go-mail.dev>
-Content-Type: multipart/mixed;
- boundary="------------26A45336F6C6196BD8BBA2A2"
-
-This is a multi-part message in MIME format.
--------------26A45336F6C6196BD8BBA2A2
-Content-Type: text/plain; charset=US-ASCII; format=flowed
-Content-Transfer-Encoding: 7bit
-
-testtest
-testtest
-testtest
-testtest
-testtest
-testtest
-
--------------26A45336F6C6196BD8BBA2A2
-Content-Type: text/plain; charset=UTF-8;
- name="testfile.txt"
-Content-Transfer-Encoding: base64
-Content-Disposition: attachment;
- filename="testfile.txt"
-
-VGh@@@@§§§§hIHRlc3QgaW4gQmFzZTY0
 --------------26A45336F6C6196BD8BBA2A2--`
 	exampleMultiPart8BitBase64 = `Date: Wed, 01 Nov 2023 00:00:00 +0000
 MIME-Version: 1.0
@ -827,352 +612,8 @@ Content-Disposition: attachment;

 VGhpcyBpcyBhIHRlc3QgaW4gQmFzZTY0
 --------------26A45336F6C6196BD8BBA2A2--`
-	exampleMailWithInlineEmbed = `Date: Wed, 01 Nov 2023 00:00:00 +0000
-MIME-Version: 1.0
-Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
-Subject: Example mail with inline embed
-User-Agent: go-mail v0.4.1 // https://github.com/wneessen/go-mail
-X-Mailer: go-mail v0.4.1 // https://github.com/wneessen/go-mail
-From: "Toni Tester" <go-mail@go-mail.dev>
-To: <go-mail+test@go-mail.dev>
-Content-Type: multipart/related; boundary="abc123"
-
--abc123
-Content-Type: text/html; charset=UTF-8
-Content-Transfer-Encoding: quoted-printable
-
-<html>
-  <body>
-    <p>Hello,</p>
-    <p>This is an example email with an inline image:</p>
-    <img src="cid:12345@go-mail.dev" alt="Inline Image">
-    <p>Best regards,<br>The go-mail team</p>
-  </body>
-</html>
--abc123
-Content-Type: image/png
-Content-Transfer-Encoding: base64
-Content-ID: <12345@go-mail.dev>
-Content-Disposition: inline; filename="test.png"
-
-iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQIW2NgYGD4DwABBAEAwS2O
-UAAAAABJRU5ErkJggg==
--abc123--`
-	exampleMailWithInlineEmbedWrongDisposition = `Date: Wed, 01 Nov 2023 00:00:00 +0000
-MIME-Version: 1.0
-Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
-Subject: Example mail with inline embed
-User-Agent: go-mail v0.4.1 // https://github.com/wneessen/go-mail
-X-Mailer: go-mail v0.4.1 // https://github.com/wneessen/go-mail
-From: "Toni Tester" <go-mail@go-mail.dev>
-To: <go-mail+test@go-mail.dev>
-Content-Type: multipart/related; boundary="abc123"
-
--abc123
-Content-Type: text/html; charset=UTF-8
-Content-Transfer-Encoding: quoted-printable
-
-<html>
-  <body>
-    <p>Hello,</p>
-    <p>This is an example email with an inline image:</p>
-    <img src="cid:12345@go-mail.dev" alt="Inline Image">
-    <p>Best regards,<br>The go-mail team</p>
-  </body>
-</html>
--abc123
-Content-Type: image/png
-Content-Transfer-Encoding: base64
-Content-ID: <12345@go-mail.dev>
-Content-Disposition: broken; filename="test.png"
-
-iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQIW2NgYGD4DwABBAEAwS2O
-UAAAAABJRU5ErkJggg==
--abc123--`
 )

-func TestEMLToMsgFromReader(t *testing.T) {
-	t.Run("EMLToMsgFromReader via EMLToMsgFromString, check subject and encoding", func(t *testing.T) {
-		tests := []struct {
-			name         string
-			emlString    string
-			wantEncoding Encoding
-			wantSubject  string
-		}{
-			{
-				"RFC5322 A1.1 example mail", exampleMailRFC5322A11, EncodingUSASCII,
-				"Saying Hello",
-			},
-			{
-				"Plain text no encoding (7bit)", exampleMailPlain7Bit, EncodingUSASCII,
-				"Example mail // plain text without encoding",
-			},
-			{
-				"Plain text no encoding", exampleMailPlainNoEnc, NoEncoding,
-				"Example mail // plain text without encoding",
-			},
-			{
-				"Plain text quoted-printable", exampleMailPlainQP, EncodingQP,
-				"Example mail // plain text quoted-printable",
-			},
-			{
-				"Plain text base64", exampleMailPlainB64, EncodingB64,
-				"Example mail // plain text base64",
-			},
-		}
-		for _, tt := range tests {
-			t.Run(tt.name, func(t *testing.T) {
-				parsed, err := EMLToMsgFromString(tt.emlString)
-				if err != nil {
-					t.Fatalf("failed to parse EML string: %s", err)
-				}
-				if parsed.Encoding() != tt.wantEncoding.String() {
-					t.Errorf("failed to parse EML string: want encoding %s, got %s", tt.wantEncoding,
-						parsed.Encoding())
-				}
-				gotSubject, ok := parsed.genHeader[HeaderSubject]
-				if !ok {
-					t.Fatalf("failed to parse EML string. No subject header found")
-				}
-				if len(gotSubject) != 1 {
-					t.Fatalf("failed to parse EML string, more than one subject header found")
-				}
-				if !strings.EqualFold(gotSubject[0], tt.wantSubject) {
-					t.Errorf("failed to parse EML string: want subject %s, got %s", tt.wantSubject,
-						gotSubject[0])
-				}
-			})
-		}
-	})
-	t.Run("EMLToMsgFromReader fails on reader", func(t *testing.T) {
-		emlReader := bytes.NewBufferString("invalid")
-		if _, err := EMLToMsgFromReader(emlReader); err == nil {
-			t.Errorf("EML parsing with invalid EML string should fail")
-		}
-	})
-	t.Run("EMLToMsgFromReader fails on parseEML", func(t *testing.T) {
-		emlReader := bytes.NewBufferString(exampleMailRFC5322A11InvalidFrom)
-		if _, err := EMLToMsgFromReader(emlReader); err == nil {
-			t.Errorf("EML parsing with invalid EML string should fail")
-		}
-	})
-	t.Run("EMLToMsgFromReader via EMLToMsgFromString on different examples", func(t *testing.T) {
-		tests := []struct {
-			name       string
-			emlString  string
-			shouldFail bool
-		}{
-			{
-				name:       "Valid RFC 5322 Example",
-				emlString:  exampleMailRFC5322A11,
-				shouldFail: false,
-			},
-			{
-				name:       "Invalid From Header (RFC 5322)",
-				emlString:  exampleMailRFC5322A11InvalidFrom,
-				shouldFail: true,
-			},
-			{
-				name:       "Invalid Header",
-				emlString:  exampleMailInvalidHeader,
-				shouldFail: true,
-			},
-			{
-				name:       "Plain broken Content-Type",
-				emlString:  exampleMailInvalidContentType,
-				shouldFail: true,
-			},
-			{
-				name:       "Plain No Encoding",
-				emlString:  exampleMailPlainNoEnc,
-				shouldFail: false,
-			},
-			{
-				name:       "Plain invalid CTE",
-				emlString:  exampleMailPlainInvalidCTE,
-				shouldFail: true,
-			},
-			{
-				name:       "Plain 7bit",
-				emlString:  exampleMailPlain7Bit,
-				shouldFail: false,
-			},
-			{
-				name:       "Broken Body Base64",
-				emlString:  exampleMailPlainBrokenBody,
-				shouldFail: true,
-			},
-			{
-				name:       "Unknown Content Type",
-				emlString:  exampleMailPlainUnknownContentType,
-				shouldFail: true,
-			},
-			{
-				name:       "Broken Header",
-				emlString:  exampleMailPlainBrokenHeader,
-				shouldFail: true,
-			},
-			{
-				name:       "Broken From Header",
-				emlString:  exampleMailPlainBrokenFrom,
-				shouldFail: true,
-			},
-			{
-				name:       "Broken To Header",
-				emlString:  exampleMailPlainBrokenTo,
-				shouldFail: true,
-			},
-			{
-				name:       "Invalid Date",
-				emlString:  exampleMailPlainNoEncInvalidDate,
-				shouldFail: true,
-			},
-			{
-				name:       "No Date Header",
-				emlString:  exampleMailPlainNoEncNoDate,
-				shouldFail: false,
-			},
-			{
-				name:       "Quoted Printable Encoding",
-				emlString:  exampleMailPlainQP,
-				shouldFail: false,
-			},
-			{
-				name:       "Unsupported Transfer Encoding",
-				emlString:  exampleMailPlainUnsupportedTransferEnc,
-				shouldFail: true,
-			},
-			{
-				name:       "Base64 Encoding",
-				emlString:  exampleMailPlainB64,
-				shouldFail: false,
-			},
-			{
-				name:       "Base64 with Attachment",
-				emlString:  exampleMailPlainB64WithAttachment,
-				shouldFail: false,
-			},
-			{
-				name:       "Base64 with Attachment no content types",
-				emlString:  exampleMailPlainB64WithAttachmentNoContentType,
-				shouldFail: true,
-			},
-			{
-				name:       "Multipart Base64 with Attachment broken Base64",
-				emlString:  exampleMailPlainB64WithAttachmentBrokenB64,
-				shouldFail: true,
-			},
-			{
-				name:       "Base64 with Attachment with invalid content type in attachment",
-				emlString:  exampleMailPlainB64WithAttachmentInvalidContentType,
-				shouldFail: true,
-			},
-			{
-				name:       "Base64 with Attachment with invalid CTE in attachment",
-				emlString:  exampleMailPlainB64WithAttachmentInvalidCTE,
-				shouldFail: true,
-			},
-			{
-				name:       "Base64 with Attachment No Boundary",
-				emlString:  exampleMailPlainB64WithAttachmentNoBoundary,
-				shouldFail: true,
-			},
-			{
-				name:       "Broken Body Base64",
-				emlString:  exampleMailPlainB64BrokenBody,
-				shouldFail: true,
-			},
-			{
-				name:       "Base64 with Embedded Image",
-				emlString:  exampleMailPlainB64WithEmbed,
-				shouldFail: false,
-			},
-			{
-				name:       "Base64 with Embed No Content-ID",
-				emlString:  exampleMailPlainB64WithEmbedNoContentID,
-				shouldFail: false,
-			},
-			{
-				name:       "Multipart Mixed with Attachment, Embed, and Alternative Part",
-				emlString:  exampleMailMultipartMixedAlternativeRelated,
-				shouldFail: false,
-			},
-			{
-				name:       "Multipart 7bit Base64",
-				emlString:  exampleMultiPart7BitBase64,
-				shouldFail: false,
-			},
-			{
-				name:       "Multipart 7bit Base64 with broken Base64",
-				emlString:  exampleMultiPart7BitBase64BrokenB64,
-				shouldFail: true,
-			},
-			{
-				name:       "Multipart 8bit Base64",
-				emlString:  exampleMultiPart8BitBase64,
-				shouldFail: false,
-			},
-			{
-				name:       "Multipart with inline embed",
-				emlString:  exampleMailWithInlineEmbed,
-				shouldFail: false,
-			},
-			{
-				name:       "Multipart with inline embed disposition broken",
-				emlString:  exampleMailWithInlineEmbedWrongDisposition,
-				shouldFail: true,
-			},
-		}
-
-		for _, tt := range tests {
-			t.Run(tt.name, func(t *testing.T) {
-				_, err := EMLToMsgFromString(tt.emlString)
-				if tt.shouldFail && err == nil {
-					t.Errorf("parsing of EML was supposed to fail, but it did not")
-				}
-				if !tt.shouldFail && err != nil {
-					t.Errorf("parsing of EML failed: %s", err)
-				}
-			})
-		}
-	})
-}
-
-func TestEMLToMsgFromFile(t *testing.T) {
-	t.Run("EMLToMsgFromFile succeeds", func(t *testing.T) {
-		parsed, err := EMLToMsgFromFile("testdata/RFC5322-A1-1.eml")
-		if err != nil {
-			t.Fatalf("EMLToMsgFromFile failed: %s ", err)
-		}
-		if parsed.Encoding() != EncodingUSASCII.String() {
-			t.Errorf("EMLToMsgFromFile failed: want encoding %s, got %s", EncodingUSASCII,
-				parsed.Encoding())
-		}
-		gotSubject, ok := parsed.genHeader[HeaderSubject]
-		if !ok {
-			t.Fatalf("failed to parse EML string. No subject header found")
-		}
-		if len(gotSubject) != 1 {
-			t.Fatalf("failed to parse EML string, more than one subject header found")
-		}
-		if !strings.EqualFold(gotSubject[0], "Saying Hello") {
-			t.Errorf("failed to parse EML string: want subject %s, got %s", "Saying Hello",
-				gotSubject[0])
-		}
-	})
-	t.Run("EMLToMsgFromFile fails on file not found", func(t *testing.T) {
-		if _, err := EMLToMsgFromFile("testdata/not-existing.eml"); err == nil {
-			t.Errorf("EMLToMsgFromFile with invalid file should fail")
-		}
-	})
-	t.Run("EMLToMsgFromFile fails on parseEML", func(t *testing.T) {
-		if _, err := EMLToMsgFromFile("testdata/RFC5322-A1-1-invalid-from.eml"); err == nil {
-			t.Errorf("EMLToMsgFromFile with invalid EML message should fail")
-		}
-	})
-}
-
-/*
 func TestEMLToMsgFromString(t *testing.T) {
 	tests := []struct {
 		name string
@ -1180,6 +621,26 @@ func TestEMLToMsgFromString(t *testing.T) {
 		enc  string
 		sub  string
 	}{
+		{
+			"RFC5322 A1.1", exampleMailRFC5322A11, "7bit",
+			"Saying Hello",
+		},
+		{
+			"Plain text no encoding (7bit)", exampleMailPlain7Bit, "7bit",
+			"Example mail // plain text without encoding",
+		},
+		{
+			"Plain text no encoding", exampleMailPlainNoEnc, "8bit",
+			"Example mail // plain text without encoding",
+		},
+		{
+			"Plain text quoted-printable", exampleMailPlainQP, "quoted-printable",
+			"Example mail // plain text quoted-printable",
+		},
+		{
+			"Plain text base64", exampleMailPlainB64, "base64",
+			"Example mail // plain text base64",
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@ -1548,6 +1009,3 @@ func stringToTempFile(data, name string) (string, string, error) {
 	}
 	return tempDir, filePath, nil
 }
-
-
-*/
--- a/file_test.go
+++ b/file_test.go
@ -6,183 +6,134 @@ package mail

 import "testing"

-func TestFile(t *testing.T) {
-	t.Run("setHeader", func(t *testing.T) {
-		f := File{
-			Name:   "testfile.txt",
-			Header: make(map[string][]string),
-		}
-		f.setHeader(HeaderContentType, "text/plain")
-		contentType, ok := f.Header[HeaderContentType.String()]
-		if !ok {
-			t.Fatalf("setHeader failed. Expected header %s to be set", HeaderContentType)
-		}
-		if len(contentType) != 1 {
-			t.Fatalf("setHeader failed. Expected header %s to have one value, got: %d", HeaderContentType,
-				len(contentType))
-		}
-		if contentType[0] != "text/plain" {
-			t.Fatalf("setHeader failed. Expected header %s to have value %s, got: %s",
-				HeaderContentType.String(), "text/plain", contentType[0])
-		}
-	})
-	t.Run("getHeader", func(t *testing.T) {
-		f := File{
-			Name:   "testfile.txt",
-			Header: make(map[string][]string),
-		}
-		f.setHeader(HeaderContentType, "text/plain")
-		contentType, ok := f.getHeader(HeaderContentType)
-		if !ok {
-			t.Fatalf("setHeader failed. Expected header %s to be set", HeaderContentType)
-		}
-		if contentType != "text/plain" {
-			t.Fatalf("setHeader failed. Expected header %s to have value %s, got: %s",
-				HeaderContentType.String(), "text/plain", contentType)
-		}
-	})
-	t.Run("WithFileDescription", func(t *testing.T) {
-		tests := []struct {
-			name string
-			desc string
-		}{
-			{"File description: test", "test"},
-			{"File description: with newline", "test\n"},
-			{"File description: empty", ""},
-		}
-		for _, tt := range tests {
-			t.Run(tt.name, func(t *testing.T) {
-				message := NewMsg()
-				message.AttachFile("file.go", WithFileDescription(tt.desc))
-				attachments := message.GetAttachments()
-				if len(attachments) <= 0 {
-					t.Fatalf("failed to retrieve attachments list")
-				}
-				firstAttachment := attachments[0]
-				if firstAttachment == nil {
-					t.Fatalf("failed to retrieve first attachment, got nil")
-				}
-				if firstAttachment.Desc != tt.desc {
-					t.Errorf("WithFileDescription() failed. Expected: %s, got: %s", tt.desc,
-						firstAttachment.Desc)
-				}
-			})
-		}
-	})
-	t.Run("WithFileContentID", func(t *testing.T) {
-		tests := []struct {
-			name string
-			id   string
-		}{
-			{"Content-ID: test", "test"},
-			{"Content-ID: with newline", "test\n"},
-			{"Content-ID: empty", ""},
-		}
-		for _, tt := range tests {
-			t.Run(tt.name, func(t *testing.T) {
-				message := NewMsg()
-				message.AttachFile("file.go", WithFileContentID(tt.id))
-				attachments := message.GetAttachments()
-				if len(attachments) <= 0 {
-					t.Fatalf("failed to retrieve attachments list")
-				}
-				firstAttachment := attachments[0]
-				if firstAttachment == nil {
-					t.Fatalf("failed to retrieve first attachment, got nil")
-				}
-				contentID := firstAttachment.Header.Get(HeaderContentID.String())
-				if contentID != tt.id {
-					t.Errorf("WithFileContentID() failed. Expected: %s, got: %s", tt.id,
-						contentID)
-				}
-			})
-		}
-	})
-	t.Run("WithFileEncoding", func(t *testing.T) {
-		tests := []struct {
-			name     string
-			encoding Encoding
-			want     Encoding
-		}{
-			{"File encoding: US-ASCII", EncodingUSASCII, EncodingUSASCII},
-			{"File encoding: 8bit raw", NoEncoding, NoEncoding},
-			{"File encoding: Base64", EncodingB64, EncodingB64},
-			{"File encoding: quoted-printable (not allowed)", EncodingQP, ""},
-		}
-		for _, tt := range tests {
-			t.Run(tt.name, func(t *testing.T) {
-				message := NewMsg()
-				message.AttachFile("file.go", WithFileEncoding(tt.encoding))
-				attachments := message.GetAttachments()
-				if len(attachments) <= 0 {
-					t.Fatalf("failed to retrieve attachments list")
-				}
-				firstAttachment := attachments[0]
-				if firstAttachment == nil {
-					t.Fatalf("failed to retrieve first attachment, got nil")
-				}
-				if firstAttachment.Enc != tt.want {
-					t.Errorf("WithFileEncoding() failed. Expected: %s, got: %s", tt.want, firstAttachment.Enc)
-				}
-			})
-		}
-	})
-	t.Run("WithFileName", func(t *testing.T) {
-		tests := []struct {
-			name     string
-			fileName string
-		}{
-			{"File name: test", "test"},
-			{"File name: with newline", "test\n"},
-			{"File name: empty", ""},
-		}
-		for _, tt := range tests {
-			t.Run(tt.name, func(t *testing.T) {
-				message := NewMsg()
-				message.AttachFile("file.go", WithFileName(tt.fileName))
-				attachments := message.GetAttachments()
-				if len(attachments) <= 0 {
-					t.Fatalf("failed to retrieve attachments list")
-				}
-				firstAttachment := attachments[0]
-				if firstAttachment == nil {
-					t.Fatalf("failed to retrieve first attachment, got nil")
-				}
-				if firstAttachment.Name != tt.fileName {
-					t.Errorf("WithFileName() failed. Expected: %s, got: %s", tt.fileName,
-						firstAttachment.Name)
-				}
-			})
-		}
-	})
-	t.Run("WithFileContentType", func(t *testing.T) {
-		tests := []struct {
-			name        string
-			contentType ContentType
-		}{
-			{"File content-type: text/plain", TypeTextPlain},
-			{"File content-type: html/html", TypeTextHTML},
-			{"File content-type: application/octet-stream", TypeAppOctetStream},
-			{"File content-type: application/pgp-encrypted", TypePGPEncrypted},
-			{"File content-type: application/pgp-signature", TypePGPSignature},
-		}
-		for _, tt := range tests {
-			t.Run(tt.name, func(t *testing.T) {
-				message := NewMsg()
-				message.AttachFile("file.go", WithFileContentType(tt.contentType))
-				attachments := message.GetAttachments()
-				if len(attachments) <= 0 {
-					t.Fatalf("failed to retrieve attachments list")
-				}
-				firstAttachment := attachments[0]
-				if firstAttachment == nil {
-					t.Fatalf("failed to retrieve first attachment, got nil")
-				}
-				if firstAttachment.ContentType != tt.contentType {
-					t.Errorf("WithFileContentType() failed. Expected: %s, got: %s", tt.contentType,
-						firstAttachment.ContentType)
-				}
-			})
-		}
-	})
+// TestFile_SetGetHeader tests the set-/getHeader method of the File object
+func TestFile_SetGetHeader(t *testing.T) {
+	f := File{
+		Name:   "testfile.txt",
+		Header: make(map[string][]string),
+	}
+	f.setHeader(HeaderContentType, "text/plain")
+	fi, ok := f.getHeader(HeaderContentType)
+	if !ok {
+		t.Errorf("getHeader method of File did not return a value")
+		return
+	}
+	if fi != "text/plain" {
+		t.Errorf("getHeader returned wrong value. Expected: %s, got: %s", "text/plain", fi)
+	}
+	fi, ok = f.getHeader(HeaderContentTransferEnc)
+	if ok {
+		t.Errorf("getHeader method of File did return a value, but wasn't supposed to")
+		return
+	}
+	if fi != "" {
+		t.Errorf("getHeader returned wrong value. Expected: %s, got: %s", "", fi)
+	}
+}
+
+// TestFile_WithFileDescription tests the WithFileDescription option
+func TestFile_WithFileDescription(t *testing.T) {
+	tests := []struct {
+		name string
+		desc string
+	}{
+		{"File description: test", "test"},
+		{"File description: empty", ""},
+	}
+	for _, tt := range tests {
+		m := NewMsg()
+		t.Run(tt.name, func(t *testing.T) {
+			m.AttachFile("file.go", WithFileDescription(tt.desc))
+			al := m.GetAttachments()
+			if len(al) <= 0 {
+				t.Errorf("AttachFile() failed. Attachment list is empty")
+			}
+			a := al[0]
+			if a.Desc != tt.desc {
+				t.Errorf("WithFileDescription() failed. Expected: %s, got: %s", tt.desc, a.Desc)
+			}
+		})
+	}
+}
+
+// TestFile_WithContentID tests the WithFileContentID option
+func TestFile_WithContentID(t *testing.T) {
+	tests := []struct {
+		name      string
+		contentid string
+	}{
+		{"File Content-ID: test", "test"},
+		{"File Content-ID: empty", ""},
+	}
+	for _, tt := range tests {
+		m := NewMsg()
+		t.Run(tt.name, func(t *testing.T) {
+			m.AttachFile("file.go", WithFileContentID(tt.contentid))
+			al := m.GetAttachments()
+			if len(al) <= 0 {
+				t.Errorf("AttachFile() failed. Attachment list is empty")
+			}
+			a := al[0]
+			if a.Header.Get(HeaderContentID.String()) != tt.contentid {
+				t.Errorf("WithFileContentID() failed. Expected: %s, got: %s", tt.contentid,
+					a.Header.Get(HeaderContentID.String()))
+			}
+		})
+	}
+}
+
+// TestFile_WithFileEncoding tests the WithFileEncoding option
+func TestFile_WithFileEncoding(t *testing.T) {
+	tests := []struct {
+		name string
+		enc  Encoding
+		want Encoding
+	}{
+		{"File encoding: 8bit raw", NoEncoding, NoEncoding},
+		{"File encoding: Base64", EncodingB64, EncodingB64},
+		{"File encoding: quoted-printable (not allowed)", EncodingQP, ""},
+	}
+	for _, tt := range tests {
+		m := NewMsg()
+		t.Run(tt.name, func(t *testing.T) {
+			m.AttachFile("file.go", WithFileEncoding(tt.enc))
+			al := m.GetAttachments()
+			if len(al) <= 0 {
+				t.Errorf("AttachFile() failed. Attachment list is empty")
+			}
+			a := al[0]
+			if a.Enc != tt.want {
+				t.Errorf("WithFileEncoding() failed. Expected: %s, got: %s", tt.enc, a.Enc)
+			}
+		})
+	}
+}
+
+// TestFile_WithFileContentType tests the WithFileContentType option
+func TestFile_WithFileContentType(t *testing.T) {
+	tests := []struct {
+		name string
+		ct   ContentType
+		want string
+	}{
+		{"File content-type: text/plain", TypeTextPlain, "text/plain"},
+		{"File content-type: html/html", TypeTextHTML, "text/html"},
+		{"File content-type: application/octet-stream", TypeAppOctetStream, "application/octet-stream"},
+		{"File content-type: application/pgp-encrypted", TypePGPEncrypted, "application/pgp-encrypted"},
+		{"File content-type: application/pgp-signature", TypePGPSignature, "application/pgp-signature"},
+	}
+	for _, tt := range tests {
+		m := NewMsg()
+		t.Run(tt.name, func(t *testing.T) {
+			m.AttachFile("file.go", WithFileContentType(tt.ct))
+			al := m.GetAttachments()
+			if len(al) <= 0 {
+				t.Errorf("AttachFile() failed. Attachment list is empty")
+			}
+			a := al[0]
+			if a.ContentType != ContentType(tt.want) {
+				t.Errorf("WithFileContentType() failed. Expected: %s, got: %s", tt.want, a.ContentType)
+			}
+		})
+	}
 }
--- a/header_test.go
+++ b/header_test.go
@ -8,13 +8,69 @@ import (
 	"testing"
 )

-var (
-	genHeaderTests = []struct {
+// TestImportance_StringFuncs tests the different string method of the Importance object
+func TestImportance_StringFuncs(t *testing.T) {
+	tests := []struct {
 		name   string
-		header Header
+		imp    Importance
+		wantns string
+		xprio  string
 		want   string
 	}{
-		{"Header: Content-Description", HeaderContentDescription, "Content-Description"},
+		{"Importance: Non-Urgent", ImportanceNonUrgent, "0", "5", "non-urgent"},
+		{"Importance: Low", ImportanceLow, "0", "5", "low"},
+		{"Importance: Normal", ImportanceNormal, "", "", ""},
+		{"Importance: High", ImportanceHigh, "1", "1", "high"},
+		{"Importance: Urgent", ImportanceUrgent, "1", "1", "urgent"},
+		{"Importance: Unknown", 9, "", "", ""},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.imp.NumString() != tt.wantns {
+				t.Errorf("wrong number string for Importance returned. Expected: %s, got: %s",
+					tt.wantns, tt.imp.NumString())
+			}
+			if tt.imp.XPrioString() != tt.xprio {
+				t.Errorf("wrong x-prio string for Importance returned. Expected: %s, got: %s",
+					tt.xprio, tt.imp.XPrioString())
+			}
+			if tt.imp.String() != tt.want {
+				t.Errorf("wrong string for Importance returned. Expected: %s, got: %s",
+					tt.want, tt.imp.String())
+			}
+		})
+	}
+}
+
+// TestAddrHeader_String tests the string method of the AddrHeader object
+func TestAddrHeader_String(t *testing.T) {
+	tests := []struct {
+		name string
+		ah   AddrHeader
+		want string
+	}{
+		{"Address header: From", HeaderFrom, "From"},
+		{"Address header: To", HeaderTo, "To"},
+		{"Address header: Cc", HeaderCc, "Cc"},
+		{"Address header: Bcc", HeaderBcc, "Bcc"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.ah.String() != tt.want {
+				t.Errorf("wrong string for AddrHeader returned. Expected: %s, got: %s",
+					tt.want, tt.ah.String())
+			}
+		})
+	}
+}
+
+// TestHeader_String tests the string method of the Header object
+func TestHeader_String(t *testing.T) {
+	tests := []struct {
+		name string
+		h    Header
+		want string
+	}{
 		{"Header: Content-Disposition", HeaderContentDisposition, "Content-Disposition"},
 		{"Header: Content-ID", HeaderContentID, "Content-ID"},
 		{"Header: Content-Language", HeaderContentLang, "Content-Language"},
@ -22,10 +78,6 @@ var (
 		{"Header: Content-Transfer-Encoding", HeaderContentTransferEnc, "Content-Transfer-Encoding"},
 		{"Header: Content-Type", HeaderContentType, "Content-Type"},
 		{"Header: Date", HeaderDate, "Date"},
-		{
-			"Header: Disposition-Notification-To", HeaderDispositionNotificationTo,
-			"Disposition-Notification-To",
-		},
 		{"Header: Importance", HeaderImportance, "Importance"},
 		{"Header: In-Reply-To", HeaderInReplyTo, "In-Reply-To"},
 		{"Header: List-Unsubscribe", HeaderListUnsubscribe, "List-Unsubscribe"},
@ -35,90 +87,19 @@ var (
 		{"Header: Organization", HeaderOrganization, "Organization"},
 		{"Header: Precedence", HeaderPrecedence, "Precedence"},
 		{"Header: Priority", HeaderPriority, "Priority"},
-		{"Header: References", HeaderReferences, "References"},
+		{"Header: HeaderReferences", HeaderReferences, "References"},
 		{"Header: Reply-To", HeaderReplyTo, "Reply-To"},
 		{"Header: Subject", HeaderSubject, "Subject"},
 		{"Header: User-Agent", HeaderUserAgent, "User-Agent"},
-		{"Header: X-Auto-Response-Suppress", HeaderXAutoResponseSuppress, "X-Auto-Response-Suppress"},
 		{"Header: X-Mailer", HeaderXMailer, "X-Mailer"},
 		{"Header: X-MSMail-Priority", HeaderXMSMailPriority, "X-MSMail-Priority"},
 		{"Header: X-Priority", HeaderXPriority, "X-Priority"},
 	}
-	addrHeaderTests = []struct {
-		name   string
-		header AddrHeader
-		want   string
-	}{
-		{"From", HeaderFrom, "From"},
-		{"To", HeaderTo, "To"},
-		{"Cc", HeaderCc, "Cc"},
-		{"Bcc", HeaderBcc, "Bcc"},
-	}
-)
-
-func TestImportance_Stringer(t *testing.T) {
-	tests := []struct {
-		name    string
-		imp     Importance
-		wantnum string
-		xprio   string
-		want    string
-	}{
-		{"Non-Urgent", ImportanceNonUrgent, "0", "5", "non-urgent"},
-		{"Low", ImportanceLow, "0", "5", "low"},
-		{"Normal", ImportanceNormal, "", "", ""},
-		{"High", ImportanceHigh, "1", "1", "high"},
-		{"Urgent", ImportanceUrgent, "1", "1", "urgent"},
-		{"Unknown", 9, "", "", ""},
-	}
-	t.Run("String", func(t *testing.T) {
-		for _, tt := range tests {
-			t.Run(tt.name, func(t *testing.T) {
-				if tt.imp.String() != tt.want {
-					t.Errorf("wrong string for Importance returned. Expected: %s, got: %s", tt.want, tt.imp.String())
-				}
-			})
-		}
-	})
-	t.Run("NumString", func(t *testing.T) {
-		for _, tt := range tests {
-			t.Run(tt.name, func(t *testing.T) {
-				if tt.imp.NumString() != tt.wantnum {
-					t.Errorf("wrong number string for Importance returned. Expected: %s, got: %s", tt.wantnum,
-						tt.imp.NumString())
-				}
-			})
-		}
-	})
-	t.Run("XPrioString", func(t *testing.T) {
-		for _, tt := range tests {
-			t.Run(tt.name, func(t *testing.T) {
-				if tt.imp.XPrioString() != tt.xprio {
-					t.Errorf("wrong x-prio string for Importance returned. Expected: %s, got: %s", tt.xprio,
-						tt.imp.XPrioString())
-				}
-			})
-		}
-	})
-}
-
-func TestAddrHeader_Stringer(t *testing.T) {
-	for _, tt := range addrHeaderTests {
+	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			if tt.header.String() != tt.want {
-				t.Errorf("wrong string for AddrHeader returned. Expected: %s, got: %s",
-					tt.want, tt.header.String())
-			}
-		})
-	}
-}
-
-func TestHeader_Stringer(t *testing.T) {
-	for _, tt := range genHeaderTests {
-		t.Run(tt.name, func(t *testing.T) {
-			if tt.header.String() != tt.want {
+			if tt.h.String() != tt.want {
 				t.Errorf("wrong string for Header returned. Expected: %s, got: %s",
-					tt.want, tt.header.String())
+					tt.want, tt.h.String())
 			}
 		})
 	}
--- a/msg.go
+++ b/msg.go
@ -367,45 +367,23 @@ func (m *Msg) SignWithTLSCertificate(keyPairTlS *tls.Certificate) error {
 		return fmt.Errorf("failed to parse intermediate certificate: %w", err)
 	}

-	leafCertificate, err := getLeafCertificate(keyPairTlS)
-	if err != nil {
-		return fmt.Errorf("failed to get leaf certificate: %w", err)
-	}
-
 	switch keyPairTlS.PrivateKey.(type) {
 	case *rsa.PrivateKey:
 		if intermediateCertificate == nil {
-			return m.SignWithSMimeRSA(keyPairTlS.PrivateKey.(*rsa.PrivateKey), leafCertificate, nil)
+			return m.SignWithSMimeRSA(keyPairTlS.PrivateKey.(*rsa.PrivateKey), keyPairTlS.Leaf, nil)
 		}
-		return m.SignWithSMimeRSA(keyPairTlS.PrivateKey.(*rsa.PrivateKey), leafCertificate, intermediateCertificate)
+		return m.SignWithSMimeRSA(keyPairTlS.PrivateKey.(*rsa.PrivateKey), keyPairTlS.Leaf, intermediateCertificate)

 	case *ecdsa.PrivateKey:
 		if intermediateCertificate == nil {
-			return m.SignWithSMimeECDSA(keyPairTlS.PrivateKey.(*ecdsa.PrivateKey), leafCertificate, nil)
+			return m.SignWithSMimeECDSA(keyPairTlS.PrivateKey.(*ecdsa.PrivateKey), keyPairTlS.Leaf, nil)
 		}
-		return m.SignWithSMimeECDSA(keyPairTlS.PrivateKey.(*ecdsa.PrivateKey), leafCertificate, intermediateCertificate)
+		return m.SignWithSMimeECDSA(keyPairTlS.PrivateKey.(*ecdsa.PrivateKey), keyPairTlS.Leaf, intermediateCertificate)
 	default:
 		return fmt.Errorf("unsupported private key type: %T", keyPairTlS.PrivateKey)
 	}
 }

-// getLeafCertificate returns the leaf certificate from a tls.Certificate.
-// PLEASE NOTE: Before Go 1.23 Certificate.Leaf was left nil, and the parsed certificate was
-// discarded. This behavior can be re-enabled by setting "x509keypairleaf=0"
-// in the GODEBUG environment variable.
-func getLeafCertificate(keyPairTlS *tls.Certificate) (*x509.Certificate, error) {
-	if keyPairTlS.Leaf != nil {
-		return keyPairTlS.Leaf, nil
-	}
-
-	cert, err := x509.ParseCertificate(keyPairTlS.Certificate[0])
-	if err != nil {
-		return nil, err
-	}
-
-	return cert, nil
-}
-
 // This method allows you to specify a character set for the email message. The charset is
 // important for ensuring that the content of the message is correctly interpreted by
 // mail clients. Common charset values include UTF-8, ISO-8859-1, and others. If a charset
@ -654,9 +632,6 @@ func (m *Msg) SetAddrHeader(header AddrHeader, values ...string) error {
 // References:
 //   - https://datatracker.ietf.org/doc/html/rfc5322#section-3.4
 func (m *Msg) SetAddrHeaderIgnoreInvalid(header AddrHeader, values ...string) {
-	if m.addrHeader == nil {
-		m.addrHeader = make(map[AddrHeader][]*mail.Address)
-	}
 	var addresses []*mail.Address
 	for _, addrVal := range values {
 		address, err := mail.ParseAddress(m.encodeString(addrVal))
@ -665,14 +640,7 @@ func (m *Msg) SetAddrHeaderIgnoreInvalid(header AddrHeader, values ...string) {
 		}
 		addresses = append(addresses, address)
 	}
-	switch header {
-	case HeaderFrom:
-		if len(addresses) > 0 {
-			m.addrHeader[header] = []*mail.Address{addresses[0]}
-		}
-	default:
-		m.addrHeader[header] = addresses
-	}
+	m.addrHeader[header] = addresses
 }

 // EnvelopeFrom sets the envelope from address for the Msg.
@ -824,16 +792,7 @@ func (m *Msg) ToIgnoreInvalid(rcpts ...string) {
 // References:
 //   - https://datatracker.ietf.org/doc/html/rfc5322#section-3.6.3
 func (m *Msg) ToFromString(rcpts string) error {
-	src := strings.Split(rcpts, ",")
-	var dst []string
-	for _, address := range src {
-		address = strings.TrimSpace(address)
-		if address == "" {
-			continue
-		}
-		dst = append(dst, address)
-	}
-	return m.To(dst...)
+	return m.To(strings.Split(rcpts, ",")...)
 }

 // Cc sets one or more "CC" (carbon copy) addresses in the mail body for the Msg.
@ -918,16 +877,7 @@ func (m *Msg) CcIgnoreInvalid(rcpts ...string) {
 // References:
 //   - https://datatracker.ietf.org/doc/html/rfc5322#section-3.6.3
 func (m *Msg) CcFromString(rcpts string) error {
-	src := strings.Split(rcpts, ",")
-	var dst []string
-	for _, address := range src {
-		address = strings.TrimSpace(address)
-		if address == "" {
-			continue
-		}
-		dst = append(dst, address)
-	}
-	return m.Cc(dst...)
+	return m.Cc(strings.Split(rcpts, ",")...)
 }

 // Bcc sets one or more "BCC" (blind carbon copy) addresses in the mail body for the Msg.
@ -1013,16 +963,7 @@ func (m *Msg) BccIgnoreInvalid(rcpts ...string) {
 // References:
 //   - https://datatracker.ietf.org/doc/html/rfc5322#section-3.6.3
 func (m *Msg) BccFromString(rcpts string) error {
-	src := strings.Split(rcpts, ",")
-	var dst []string
-	for _, address := range src {
-		address = strings.TrimSpace(address)
-		if address == "" {
-			continue
-		}
-		dst = append(dst, address)
-	}
-	return m.Bcc(dst...)
+	return m.Bcc(strings.Split(rcpts, ",")...)
 }

 // ReplyTo sets the "Reply-To" address for the Msg, specifying where replies should be sent.
@ -1158,7 +1099,8 @@ func (m *Msg) SetBulk() {
 //   - https://datatracker.ietf.org/doc/html/rfc5322#section-3.3
 //   - https://datatracker.ietf.org/doc/html/rfc1123
 func (m *Msg) SetDate() {
-	m.SetDateWithValue(time.Now())
+	now := time.Now().Format(time.RFC1123Z)
+	m.SetGenHeader(HeaderDate, now)
 }

 // SetDateWithValue sets the "Date" header for the Msg using the provided time value in a valid RFC 1123 format.
@ -1258,9 +1200,6 @@ func (m *Msg) IsDelivered() bool {
 // References:
 //   - https://datatracker.ietf.org/doc/html/rfc8098
 func (m *Msg) RequestMDNTo(rcpts ...string) error {
-	if m.genHeader == nil {
-		m.genHeader = make(map[Header][]string)
-	}
 	var addresses []string
 	for _, addrVal := range rcpts {
 		address, err := mail.ParseAddress(addrVal)
@ -1269,7 +1208,9 @@ func (m *Msg) RequestMDNTo(rcpts ...string) error {
 		}
 		addresses = append(addresses, address.String())
 	}
-	m.genHeader[HeaderDispositionNotificationTo] = addresses
+	if _, ok := m.genHeader[HeaderDispositionNotificationTo]; ok {
+		m.genHeader[HeaderDispositionNotificationTo] = addresses
+	}
 	return nil
 }

@ -1308,11 +1249,11 @@ func (m *Msg) RequestMDNAddTo(rcpt string) error {
 		return fmt.Errorf(errParseMailAddr, rcpt, err)
 	}
 	var addresses []string
-	if current, ok := m.genHeader[HeaderDispositionNotificationTo]; ok {
-		addresses = current
-	}
+	addresses = append(addresses, m.genHeader[HeaderDispositionNotificationTo]...)
 	addresses = append(addresses, address.String())
-	m.genHeader[HeaderDispositionNotificationTo] = addresses
+	if _, ok := m.genHeader[HeaderDispositionNotificationTo]; ok {
+		m.genHeader[HeaderDispositionNotificationTo] = addresses
+	}
 	return nil
 }

@ -1752,11 +1693,11 @@ func (m *Msg) SetBodyHTMLTemplate(tpl *ht.Template, data interface{}, opts ...Pa
 	if tpl == nil {
 		return errors.New(errTplPointerNil)
 	}
-	buffer := bytes.NewBuffer(nil)
-	if err := tpl.Execute(buffer, data); err != nil {
+	buffer := bytes.Buffer{}
+	if err := tpl.Execute(&buffer, data); err != nil {
 		return fmt.Errorf(errTplExecuteFailed, err)
 	}
-	writeFunc := writeFuncFromBuffer(buffer)
+	writeFunc := writeFuncFromBuffer(&buffer)
 	m.SetBodyWriter(TypeTextHTML, writeFunc, opts...)
 	return nil
 }
@ -1783,11 +1724,11 @@ func (m *Msg) SetBodyTextTemplate(tpl *tt.Template, data interface{}, opts ...Pa
 	if tpl == nil {
 		return errors.New(errTplPointerNil)
 	}
-	buffer := bytes.NewBuffer(nil)
-	if err := tpl.Execute(buffer, data); err != nil {
+	buf := bytes.Buffer{}
+	if err := tpl.Execute(&buf, data); err != nil {
 		return fmt.Errorf(errTplExecuteFailed, err)
 	}
-	writeFunc := writeFuncFromBuffer(buffer)
+	writeFunc := writeFuncFromBuffer(&buf)
 	m.SetBodyWriter(TypeTextPlain, writeFunc, opts...)
 	return nil
 }
@ -1857,11 +1798,11 @@ func (m *Msg) AddAlternativeHTMLTemplate(tpl *ht.Template, data interface{}, opt
 	if tpl == nil {
 		return errors.New(errTplPointerNil)
 	}
-	buffer := bytes.NewBuffer(nil)
-	if err := tpl.Execute(buffer, data); err != nil {
+	buffer := bytes.Buffer{}
+	if err := tpl.Execute(&buffer, data); err != nil {
 		return fmt.Errorf(errTplExecuteFailed, err)
 	}
-	writeFunc := writeFuncFromBuffer(buffer)
+	writeFunc := writeFuncFromBuffer(&buffer)
 	m.AddAlternativeWriter(TypeTextHTML, writeFunc, opts...)
 	return nil
 }
@ -1887,11 +1828,11 @@ func (m *Msg) AddAlternativeTextTemplate(tpl *tt.Template, data interface{}, opt
 	if tpl == nil {
 		return errors.New(errTplPointerNil)
 	}
-	buffer := bytes.NewBuffer(nil)
-	if err := tpl.Execute(buffer, data); err != nil {
+	buffer := bytes.Buffer{}
+	if err := tpl.Execute(&buffer, data); err != nil {
 		return fmt.Errorf(errTplExecuteFailed, err)
 	}
-	writeFunc := writeFuncFromBuffer(buffer)
+	writeFunc := writeFuncFromBuffer(&buffer)
 	m.AddAlternativeWriter(TypeTextPlain, writeFunc, opts...)
 	return nil
 }
@ -2488,8 +2429,8 @@ func (m *Msg) WriteToSendmailWithContext(ctx context.Context, sendmailPath strin
 //   - https://datatracker.ietf.org/doc/html/rfc5322
 func (m *Msg) NewReader() *Reader {
 	reader := &Reader{}
-	buffer := bytes.NewBuffer(nil)
-	_, err := m.Write(buffer)
+	buffer := bytes.Buffer{}
+	_, err := m.Write(&buffer)
 	if err != nil {
 		reader.err = fmt.Errorf("failed to write Msg to Reader buffer: %w", err)
 	}
--- a/msg_nowin_test.go
+++ b/msg_nowin_test.go
@ -0,0 +1,85 @@
+// SPDX-FileCopyrightText: 2022-2023 The go-mail Authors
+//
+// SPDX-License-Identifier: MIT
+
+//go:build !windows
+// +build !windows
+
+package mail
+
+import (
+	"context"
+	"os"
+	"testing"
+	"time"
+)
+
+// TestMsg_WriteToSendmailWithContext tests the WriteToSendmailWithContext() method of the Msg
+func TestMsg_WriteToSendmailWithContext(t *testing.T) {
+	if os.Getenv("TEST_SKIP_SENDMAIL") != "" {
+		t.Skipf("TEST_SKIP_SENDMAIL variable is set. Skipping sendmail test")
+	}
+	tests := []struct {
+		name string
+		sp   string
+		sf   bool
+	}{
+		{"Sendmail path: /dev/null", "/dev/null", true},
+		{"Sendmail path: /bin/cat", "/bin/cat", true},
+		{"Sendmail path: /is/invalid", "/is/invalid", true},
+		{"Sendmail path: /bin/echo", "/bin/echo", false},
+	}
+	m := NewMsg()
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			ctx, cfn := context.WithTimeout(context.Background(), time.Second*10)
+			defer cfn()
+			m.SetBodyString(TypeTextPlain, "Plain")
+			if err := m.WriteToSendmailWithContext(ctx, tt.sp); err != nil && !tt.sf {
+				t.Errorf("WriteToSendmailWithCommand() failed: %s", err)
+			}
+			m.Reset()
+		})
+	}
+}
+
+// TestMsg_WriteToSendmail will test the output to the local sendmail command
+func TestMsg_WriteToSendmail(t *testing.T) {
+	if os.Getenv("TEST_SKIP_SENDMAIL") != "" {
+		t.Skipf("TEST_SKIP_SENDMAIL variable is set. Skipping sendmail test")
+	}
+	_, err := os.Stat(SendmailPath)
+	if err != nil {
+		t.Skipf("local sendmail command not found in expected path. Skipping")
+	}
+
+	m := NewMsg()
+	_ = m.From("Toni Tester <tester@example.com>")
+	_ = m.To(TestRcpt)
+	m.SetBodyString(TypeTextPlain, "This is a test")
+	if err := m.WriteToSendmail(); err != nil {
+		t.Errorf("WriteToSendmail failed: %s", err)
+	}
+}
+
+func TestMsg_WriteToTempFileFailed(t *testing.T) {
+	m := NewMsg()
+	_ = m.From("Toni Tester <tester@example.com>")
+	_ = m.To("Ellenor Tester <ellinor@example.com>")
+	m.SetBodyString(TypeTextPlain, "This is a test")
+
+	curTmpDir := os.Getenv("TMPDIR")
+	defer func() {
+		if err := os.Setenv("TMPDIR", curTmpDir); err != nil {
+			t.Errorf("failed to set TMPDIR environment variable: %s", err)
+		}
+	}()
+
+	if err := os.Setenv("TMPDIR", "/invalid/directory/that/does/not/exist"); err != nil {
+		t.Errorf("failed to set TMPDIR environment variable: %s", err)
+	}
+	_, err := m.WriteToTempFile()
+	if err == nil {
+		t.Errorf("WriteToTempFile() did not fail as expected")
+	}
+}
--- a/msg_test.go
+++ b/msg_test.go
--- a/msg_unix_test.go
+++ b/msg_unix_test.go
@ -1,146 +0,0 @@
-// SPDX-FileCopyrightText: 2022-2023 The go-mail Authors
-//
-// SPDX-License-Identifier: MIT
-
-//go:build linux || freebsd
-// +build linux freebsd
-
-package mail
-
-import (
-	"bytes"
-	"errors"
-	"os"
-	"testing"
-)
-
-func TestMsg_AttachFile_unixOnly(t *testing.T) {
-	t.Run("AttachFile with fileFromFS fails on open", func(t *testing.T) {
-		if os.Getenv("PERFORM_UNIX_OPEN_WRITE_TESTS") != "true" {
-			t.Skipf("PERFORM_UNIX_OPEN_WRITE_TESTS variable is not set. Skipping unix open/write tests")
-		}
-
-		tempFile, err := os.CreateTemp("", "attachfile-open-write-test.*.txt")
-		if err != nil {
-			t.Fatalf("failed to create temp file: %s", err)
-		}
-		t.Cleanup(func() {
-			if err := os.Remove(tempFile.Name()); err != nil {
-				t.Errorf("failed to remove temp file: %s", err)
-			}
-		})
-		if err = os.Chmod(tempFile.Name(), 0o000); err != nil {
-			t.Fatalf("failed to chmod temp file: %s", err)
-		}
-
-		message := NewMsg()
-		if message == nil {
-			t.Fatal("message is nil")
-		}
-		message.AttachFile(tempFile.Name())
-		attachments := message.GetAttachments()
-		if len(attachments) != 1 {
-			t.Fatalf("failed to get attachments, expected 1, got: %d", len(attachments))
-		}
-		messageBuf := bytes.NewBuffer(nil)
-		_, err = attachments[0].Writer(messageBuf)
-		if err == nil {
-			t.Error("writer func expected to fail, but didn't")
-		}
-		if !errors.Is(err, os.ErrPermission) {
-			t.Errorf("expected error to be %s, got: %s", os.ErrPermission, err)
-		}
-	})
-}
-
-func TestMsg_EmbedFile_unixOnly(t *testing.T) {
-	t.Run("EmbedFile with fileFromFS fails on open", func(t *testing.T) {
-		if os.Getenv("PERFORM_UNIX_OPEN_WRITE_TESTS") != "true" {
-			t.Skipf("PERFORM_UNIX_OPEN_WRITE_TESTS variable is not set. Skipping unix open/write tests")
-		}
-
-		tempFile, err := os.CreateTemp("", "embedfile-open-write-test.*.txt")
-		if err != nil {
-			t.Fatalf("failed to create temp file: %s", err)
-		}
-		t.Cleanup(func() {
-			if err := os.Remove(tempFile.Name()); err != nil {
-				t.Errorf("failed to remove temp file: %s", err)
-			}
-		})
-		if err = os.Chmod(tempFile.Name(), 0o000); err != nil {
-			t.Fatalf("failed to chmod temp file: %s", err)
-		}
-
-		message := NewMsg()
-		if message == nil {
-			t.Fatal("message is nil")
-		}
-		message.EmbedFile(tempFile.Name())
-		embeds := message.GetEmbeds()
-		if len(embeds) != 1 {
-			t.Fatalf("failed to get embeds, expected 1, got: %d", len(embeds))
-		}
-		messageBuf := bytes.NewBuffer(nil)
-		_, err = embeds[0].Writer(messageBuf)
-		if err == nil {
-			t.Error("writer func expected to fail, but didn't")
-		}
-		if !errors.Is(err, os.ErrPermission) {
-			t.Errorf("expected error to be %s, got: %s", os.ErrPermission, err)
-		}
-	})
-}
-
-func TestMsg_WriteToFile_unixOnly(t *testing.T) {
-	t.Run("WriteToFile fails on create", func(t *testing.T) {
-		if os.Getenv("PERFORM_UNIX_OPEN_WRITE_TESTS") != "true" {
-			t.Skipf("PERFORM_UNIX_OPEN_WRITE_TESTS variable is not set. Skipping unix open/write tests")
-		}
-
-		tempfile, err := os.CreateTemp("", "testmail-create.*.eml")
-		if err != nil {
-			t.Fatalf("failed to create temp file: %s", err)
-		}
-		if err = os.Chmod(tempfile.Name(), 0o000); err != nil {
-			t.Fatalf("failed to chmod temp file: %s", err)
-		}
-		t.Cleanup(func() {
-			if err = tempfile.Close(); err != nil {
-				t.Fatalf("failed to close temp file: %s", err)
-			}
-			if err = os.Remove(tempfile.Name()); err != nil {
-				t.Fatalf("failed to remove temp file: %s", err)
-			}
-		})
-		message := testMessage(t)
-		if err = message.WriteToFile(tempfile.Name()); err == nil {
-			t.Errorf("expected error, got nil")
-		}
-	})
-}
-
-func TestMsg_WriteToTempFile_unixOnly(t *testing.T) {
-	if os.Getenv("PERFORM_UNIX_OPEN_WRITE_TESTS") != "true" {
-		t.Skipf("PERFORM_UNIX_OPEN_WRITE_TESTS variable is not set. Skipping unix open/write tests")
-	}
-
-	t.Run("WriteToTempFile fails on invalid TMPDIR", func(t *testing.T) {
-		// We store the current TMPDIR variable so we can set it back when the test is over
-		curTmpDir := os.Getenv("TMPDIR")
-		t.Cleanup(func() {
-			if err := os.Setenv("TMPDIR", curTmpDir); err != nil {
-				t.Errorf("failed to set TMPDIR environment variable: %s", err)
-			}
-		})
-
-		if err := os.Setenv("TMPDIR", "/invalid/directory/that/does/not/exist"); err != nil {
-			t.Fatalf("failed to set TMPDIR environment variable: %s", err)
-		}
-		message := testMessage(t)
-		_, err := message.WriteToTempFile()
-		if err == nil {
-			t.Errorf("expected writing to invalid TMPDIR to fail, got: %s", err)
-		}
-	})
-}
--- a/msgwriter_test.go
+++ b/msgwriter_test.go
@ -6,675 +6,153 @@ package mail

 import (
 	"bytes"
-	"errors"
 	"fmt"
 	"io"
 	"mime"
-	"runtime"
 	"strings"
 	"testing"
 	"time"
 )

+// brokenWriter implements a broken writer for io.Writer testing
+type brokenWriter struct {
+	io.Writer
+}
+
+// Write implements the io.Writer interface but intentionally returns an error at
+// any time
+func (bw *brokenWriter) Write([]byte) (int, error) {
+	return 0, fmt.Errorf("intentionally failed")
+}
+
+// TestMsgWriter_Write tests the WriteTo() method of the msgWriter
 func TestMsgWriter_Write(t *testing.T) {
-	t.Run("msgWriter writes to memory for all charsets", func(t *testing.T) {
-		for _, tt := range charsetTests {
-			t.Run(tt.name, func(t *testing.T) {
-				buffer := bytes.NewBuffer(nil)
-				msgwriter := &msgWriter{
-					writer:  buffer,
-					charset: tt.value,
-					encoder: mime.QEncoding,
-				}
-				_, err := msgwriter.Write([]byte("test"))
-				if err != nil {
-					t.Errorf("msgWriter failed to write: %s", err)
-				}
-			})
-		}
-	})
-	t.Run("msgWriter writes to memory for all encodings", func(t *testing.T) {
-		for _, tt := range encodingTests {
-			t.Run(tt.name, func(t *testing.T) {
-				buffer := bytes.NewBuffer(nil)
-				msgwriter := &msgWriter{
-					writer:  buffer,
-					charset: CharsetUTF8,
-					encoder: getEncoder(tt.value),
-				}
-				_, err := msgwriter.Write([]byte("test"))
-				if err != nil {
-					t.Errorf("msgWriter failed to write: %s", err)
-				}
-			})
-		}
-	})
-	t.Run("msgWriter should fail on write", func(t *testing.T) {
-		msgwriter := &msgWriter{
-			writer:  failReadWriteSeekCloser{},
-			charset: CharsetUTF8,
-			encoder: getEncoder(EncodingQP),
-		}
-		_, err := msgwriter.Write([]byte("test"))
-		if err == nil {
-			t.Fatalf("msgWriter was supposed to fail on write")
-		}
-	})
-	t.Run("msgWriter should fail on previous error", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter := &msgWriter{
-			writer:  buffer,
-			charset: CharsetUTF8,
-			encoder: getEncoder(EncodingQP),
-		}
-		_, err := msgwriter.Write([]byte("test"))
-		if err != nil {
-			t.Errorf("msgWriter failed to write: %s", err)
-		}
-		msgwriter.err = errors.New("intentionally failed")
-		_, err = msgwriter.Write([]byte("test2"))
-		if err == nil {
-			t.Fatalf("msgWriter was supposed to fail on second write")
-		}
-	})
+	bw := &brokenWriter{}
+	mw := &msgWriter{writer: bw, charset: CharsetUTF8, encoder: mime.QEncoding}
+	_, err := mw.Write([]byte("test"))
+	if err == nil {
+		t.Errorf("msgWriter WriteTo() with brokenWriter should fail, but didn't")
+	}
+
+	// Also test the part when a previous error happened
+	mw.err = fmt.Errorf("broken")
+	_, err = mw.Write([]byte("test"))
+	if err == nil {
+		t.Errorf("msgWriter WriteTo() with brokenWriter should fail, but didn't")
+	}
 }

+// TestMsgWriter_writeMsg tests the writeMsg method of the msgWriter
 func TestMsgWriter_writeMsg(t *testing.T) {
-	msgwriter := &msgWriter{
-		charset: CharsetUTF8,
-		encoder: getEncoder(EncodingQP),
-	}
-	t.Run("msgWriter writes a simple message", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		now := time.Now()
-		msgwriter.writer = buffer
-		message := testMessage(t)
-		message.SetDateWithValue(now)
-		message.SetMessageIDWithValue("message@id.com")
-		message.SetBulk()
-		msgwriter.writeMsg(message)
-		if msgwriter.err != nil {
-			t.Errorf("msgWriter failed to write: %s", msgwriter.err)
-		}
+	m := NewMsg()
+	_ = m.From(`"Toni Tester" <test@example.com>`)
+	_ = m.To(`"Toni Receiver" <receiver@example.com>`)
+	m.Subject("This is a subject")
+	m.SetBulk()
+	now := time.Now()
+	m.SetDateWithValue(now)
+	m.SetMessageIDWithValue("message@id.com")
+	m.SetBodyString(TypeTextPlain, "This is the body")
+	m.AddAlternativeString(TypeTextHTML, "This is the alternative body")
+	buf := bytes.Buffer{}
+	mw := &msgWriter{writer: &buf, charset: CharsetUTF8, encoder: mime.QEncoding}
+	mw.writeMsg(m)
+	ms := buf.String()

-		var incorrectFields []string
-		if !strings.Contains(buffer.String(), "MIME-Version: 1.0\r\n") {
-			incorrectFields = append(incorrectFields, "MIME-Version")
+	var ea []string
+	if !strings.Contains(ms, `MIME-Version: 1.0`) {
+		ea = append(ea, "MIME-Version")
+	}
+	if !strings.Contains(ms, fmt.Sprintf("Date: %s", now.Format(time.RFC1123Z))) {
+		ea = append(ea, "Date")
+	}
+	if !strings.Contains(ms, `Message-ID: <message@id.com>`) {
+		ea = append(ea, "Message-ID")
+	}
+	if !strings.Contains(ms, `Precedence: bulk`) {
+		ea = append(ea, "Precedence")
+	}
+	if !strings.Contains(ms, `Subject: This is a subject`) {
+		ea = append(ea, "Subject")
+	}
+	if !strings.Contains(ms, `User-Agent: go-mail v`) {
+		ea = append(ea, "User-Agent")
+	}
+	if !strings.Contains(ms, `X-Mailer: go-mail v`) {
+		ea = append(ea, "X-Mailer")
+	}
+	if !strings.Contains(ms, `From: "Toni Tester" <test@example.com>`) {
+		ea = append(ea, "From")
+	}
+	if !strings.Contains(ms, `To: "Toni Receiver" <receiver@example.com>`) {
+		ea = append(ea, "To")
+	}
+	if !strings.Contains(ms, `Content-Type: text/plain; charset=UTF-8`) {
+		ea = append(ea, "Content-Type")
+	}
+	if !strings.Contains(ms, `Content-Transfer-Encoding: quoted-printable`) {
+		ea = append(ea, "Content-Transfer-Encoding")
+	}
+	if !strings.Contains(ms, "\r\n\r\nThis is the body") {
+		ea = append(ea, "Message body")
+	}
+
+	pl := m.GetParts()
+	if len(pl) <= 0 {
+		t.Errorf("expected multiple parts but got none")
+		return
+	}
+	if len(pl) == 2 {
+		ap := pl[1]
+		ap.SetCharset(CharsetISO88591)
+	}
+	buf.Reset()
+	mw.writeMsg(m)
+	ms = buf.String()
+	if !strings.Contains(ms, "\r\n\r\nThis is the alternative body") {
+		ea = append(ea, "Message alternative body")
+	}
+	if !strings.Contains(ms, `Content-Type: text/html; charset=ISO-8859-1`) {
+		ea = append(ea, "alternative body charset")
+	}
+
+	if len(ea) > 0 {
+		em := "writeMsg() failed. The following errors occurred:\n"
+		for e := range ea {
+			em += fmt.Sprintf("* incorrect %q field", ea[e])
 		}
-		if !strings.Contains(buffer.String(), fmt.Sprintf("Date: %s\r\n", now.Format(time.RFC1123Z))) {
-			incorrectFields = append(incorrectFields, "Date")
-		}
-		if !strings.Contains(buffer.String(), "Message-ID: <message@id.com>\r\n") {
-			incorrectFields = append(incorrectFields, "Message-ID")
-		}
-		if !strings.Contains(buffer.String(), "Precedence: bulk\r\n") {
-			incorrectFields = append(incorrectFields, "Precedence")
-		}
-		if !strings.Contains(buffer.String(), "X-Auto-Response-Suppress: All\r\n") {
-			incorrectFields = append(incorrectFields, "X-Auto-Response-Suppress")
-		}
-		if !strings.Contains(buffer.String(), "Subject: Testmail\r\n") {
-			incorrectFields = append(incorrectFields, "Subject")
-		}
-		if !strings.Contains(buffer.String(), "User-Agent: go-mail v") {
-			incorrectFields = append(incorrectFields, "User-Agent")
-		}
-		if !strings.Contains(buffer.String(), "X-Mailer: go-mail v") {
-			incorrectFields = append(incorrectFields, "X-Mailer")
-		}
-		if !strings.Contains(buffer.String(), `From: <`+TestSenderValid+`>`) {
-			incorrectFields = append(incorrectFields, "From")
-		}
-		if !strings.Contains(buffer.String(), `To: <`+TestRcptValid+`>`) {
-			incorrectFields = append(incorrectFields, "From")
-		}
-		if !strings.Contains(buffer.String(), "Content-Type: text/plain; charset=UTF-8\r\n") {
-			incorrectFields = append(incorrectFields, "Content-Type")
-		}
-		if !strings.Contains(buffer.String(), "Content-Transfer-Encoding: quoted-printable\r\n") {
-			incorrectFields = append(incorrectFields, "Content-Transfer-Encoding")
-		}
-		if !strings.HasSuffix(buffer.String(), "\r\n\r\nTestmail") {
-			incorrectFields = append(incorrectFields, "Message body")
-		}
-		if len(incorrectFields) > 0 {
-			t.Fatalf("msgWriter failed to write correct fields: %s - mail: %s",
-				strings.Join(incorrectFields, ", "), buffer.String())
-		}
-	})
-	t.Run("msgWriter with no from address uses envelope from", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		message := NewMsg()
-		if message == nil {
-			t.Fatal("failed to create new message")
-		}
-		if err := message.EnvelopeFrom(TestSenderValid); err != nil {
-			t.Errorf("failed to set sender address: %s", err)
-		}
-		if err := message.To(TestRcptValid); err != nil {
-			t.Errorf("failed to set recipient address: %s", err)
-		}
-		message.Subject("Testmail")
-		message.SetBodyString(TypeTextPlain, "Testmail")
-		msgwriter.writeMsg(message)
-		if msgwriter.err != nil {
-			t.Errorf("msgWriter failed to write: %s", msgwriter.err)
-		}
-		if !strings.Contains(buffer.String(), "From: <"+TestSenderValid+">") {
-			t.Errorf("expected envelope from address as from address, got: %s", buffer.String())
-		}
-	})
-	t.Run("msgWriter with no from address or envelope from", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		message := NewMsg()
-		if message == nil {
-			t.Fatal("failed to create new message")
-		}
-		msgwriter.writeMsg(message)
-		if msgwriter.err != nil {
-			t.Errorf("msgWriter failed to write: %s", msgwriter.err)
-		}
-		if strings.Contains(buffer.String(), "From:") {
-			t.Errorf("expected no from address, got: %s", buffer.String())
-		}
-	})
-	t.Run("msgWriter writes a multipart/mixed message", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		message := testMessage(t, WithBoundary("testboundary"))
-		message.AttachFile("testdata/attachment.txt")
-		msgwriter.writeMsg(message)
-		if msgwriter.err != nil {
-			t.Errorf("msgWriter failed to write: %s", msgwriter.err)
-		}
-		if !strings.Contains(buffer.String(), "Content-Type: multipart/mixed") {
-			t.Errorf("expected multipart/mixed, got: %s", buffer.String())
-		}
-		if !strings.Contains(buffer.String(), "--testboundary\r\n") {
-			t.Errorf("expected boundary, got: %s", buffer.String())
-		}
-		if !strings.Contains(buffer.String(), "--testboundary--") {
-			t.Errorf("expected end boundary, got: %s", buffer.String())
-		}
-	})
-	t.Run("msgWriter writes a multipart/related message", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		message := testMessage(t, WithBoundary("testboundary"))
-		message.EmbedFile("testdata/embed.txt")
-		msgwriter.writeMsg(message)
-		if msgwriter.err != nil {
-			t.Errorf("msgWriter failed to write: %s", msgwriter.err)
-		}
-		if !strings.Contains(buffer.String(), "Content-Type: multipart/related") {
-			t.Errorf("expected multipart/related, got: %s", buffer.String())
-		}
-		if !strings.Contains(buffer.String(), "--testboundary\r\n") {
-			t.Errorf("expected boundary, got: %s", buffer.String())
-		}
-		if !strings.Contains(buffer.String(), "--testboundary--") {
-			t.Errorf("expected end boundary, got: %s", buffer.String())
-		}
-	})
-	t.Run("msgWriter writes a multipart/alternative message", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		message := testMessage(t, WithBoundary("testboundary"))
-		message.AddAlternativeString(TypeTextHTML, "<html><body><h1>Testmail</h1></body></html>")
-		msgwriter.writeMsg(message)
-		if msgwriter.err != nil {
-			t.Errorf("msgWriter failed to write: %s", msgwriter.err)
-		}
-		if !strings.Contains(buffer.String(), "Content-Type: multipart/alternative") {
-			t.Errorf("expected multipart/alternative, got: %s", buffer.String())
-		}
-		if !strings.Contains(buffer.String(), "--testboundary\r\n") {
-			t.Errorf("expected boundary, got: %s", buffer.String())
-		}
-		if !strings.Contains(buffer.String(), "--testboundary--") {
-			t.Errorf("expected end boundary, got: %s", buffer.String())
-		}
-	})
-	t.Run("msgWriter writes a application/pgp-encrypted message", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		message := testMessage(t, WithPGPType(PGPEncrypt), WithBoundary("testboundary"))
-		msgwriter.writeMsg(message)
-		if msgwriter.err != nil {
-			t.Errorf("msgWriter failed to write: %s", msgwriter.err)
-		}
-		if !strings.Contains(buffer.String(), "Content-Type: multipart/encrypted") {
-			t.Errorf("expected multipart/encrypted, got: %s", buffer.String())
-		}
-		if !strings.Contains(buffer.String(), "--testboundary\r\n") {
-			t.Errorf("expected boundary, got: %s", buffer.String())
-		}
-	})
-	t.Run("msgWriter writes a application/pgp-signature message", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		message := testMessage(t, WithPGPType(PGPSignature), WithBoundary("testboundary"))
-		msgwriter.writeMsg(message)
-		if msgwriter.err != nil {
-			t.Errorf("msgWriter failed to write: %s", msgwriter.err)
-		}
-		if !strings.Contains(buffer.String(), "Content-Type: multipart/signed") {
-			t.Errorf("expected multipart/signed, got: %s", buffer.String())
-		}
-		if !strings.Contains(buffer.String(), "--testboundary\r\n") {
-			t.Errorf("expected boundary, got: %s", buffer.String())
-		}
-	})
-	t.Run("msgWriter should ignore NoPGP", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		message := testMessage(t, WithBoundary("testboundary"))
-		message.pgptype = 9
-		msgwriter.writeMsg(message)
-		if msgwriter.err != nil {
-			t.Errorf("msgWriter failed to write: %s", msgwriter.err)
-		}
-		if !strings.Contains(buffer.String(), "--testboundary\r\n") {
-			t.Errorf("expected boundary, got: %s", buffer.String())
-		}
-	})
+		em += fmt.Sprintf("\n\nFull message:\n%s", ms)
+		t.Error(em)
+	}
 }

-func TestMsgWriter_writePreformattedGenHeader(t *testing.T) {
-	t.Run("message with no preformatted headerset", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter := &msgWriter{
-			writer:  buffer,
-			charset: CharsetUTF8,
-			encoder: getEncoder(EncodingQP),
-		}
-		message := testMessage(t)
-		message.SetGenHeaderPreformatted(HeaderContentID, "This is a content id")
-		msgwriter.writeMsg(message)
-		if !strings.Contains(buffer.String(), "Content-ID: This is a content id\r\n") {
-			t.Errorf("expected preformatted header, got: %s", buffer.String())
-		}
-	})
-}
-
-func TestMsgWriter_addFiles(t *testing.T) {
-	msgwriter := &msgWriter{
-		charset: CharsetUTF8,
-		encoder: getEncoder(EncodingQP),
+// TestMsgWriter_writeMsg_PGP tests the writeMsg method of the msgWriter with PGP types set
+func TestMsgWriter_writeMsg_PGP(t *testing.T) {
+	m := NewMsg(WithPGPType(PGPEncrypt))
+	_ = m.From(`"Toni Tester" <test@example.com>`)
+	_ = m.To(`"Toni Receiver" <receiver@example.com>`)
+	m.Subject("This is a subject")
+	m.SetBodyString(TypeTextPlain, "This is the body")
+	buf := bytes.Buffer{}
+	mw := &msgWriter{writer: &buf, charset: CharsetUTF8, encoder: mime.QEncoding}
+	mw.writeMsg(m)
+	ms := buf.String()
+	if !strings.Contains(ms, `encrypted; protocol="application/pgp-encrypted"`) {
+		t.Errorf("writeMsg failed. Expected PGP encoding header but didn't find it in message output")
 	}
-	t.Run("message with a single file attached", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		message := testMessage(t)
-		message.AttachFile("testdata/attachment.txt")
-		msgwriter.writeMsg(message)
-		if msgwriter.err != nil {
-			t.Errorf("msgWriter failed to write: %s", msgwriter.err)
-		}
-		switch runtime.GOOS {
-		case "windows":
-			if !strings.Contains(buffer.String(), "VGhpcyBpcyBhIHRlc3QgYXR0YWNobWVudA0K") {
-				t.Errorf("attachment not found in mail message. Mail: %s", buffer.String())
-			}
-		default:
-			if !strings.Contains(buffer.String(), "VGhpcyBpcyBhIHRlc3QgYXR0YWNobWVudAo=") {
-				t.Errorf("attachment not found in mail message. Mail: %s", buffer.String())
-			}
-		}
-		if !strings.Contains(buffer.String(), `Content-Disposition: attachment; filename="attachment.txt"`) {
-			t.Errorf("Content-Dispositon header not found for attachment. Mail: %s", buffer.String())
-		}
-		switch runtime.GOOS {
-		case "freebsd":
-			if !strings.Contains(buffer.String(), `Content-Type: application/octet-stream; name="attachment.txt"`) {
-				t.Errorf("Content-Type header not found for attachment. Mail: %s", buffer.String())
-			}
-		default:
-			if !strings.Contains(buffer.String(), `Content-Type: text/plain; charset=utf-8; name="attachment.txt"`) {
-				t.Errorf("Content-Type header not found for attachment. Mail: %s", buffer.String())
-			}
-		}
-	})
-	t.Run("message with a single file attached no extension", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		message := testMessage(t)
-		message.AttachFile("testdata/attachment")
-		msgwriter.writeMsg(message)
-		if msgwriter.err != nil {
-			t.Errorf("msgWriter failed to write: %s", msgwriter.err)
-		}
-		switch runtime.GOOS {
-		case "windows":
-			if !strings.Contains(buffer.String(), "VGhpcyBpcyBhIHRlc3QgYXR0YWNobWVudA0K") {
-				t.Errorf("attachment not found in mail message. Mail: %s", buffer.String())
-			}
-		default:
-			if !strings.Contains(buffer.String(), "VGhpcyBpcyBhIHRlc3QgYXR0YWNobWVudAo=") {
-				t.Errorf("attachment not found in mail message. Mail: %s", buffer.String())
-			}
-		}
-		if !strings.Contains(buffer.String(), `Content-Disposition: attachment; filename="attachment"`) {
-			t.Errorf("Content-Dispositon header not found for attachment. Mail: %s", buffer.String())
-		}
-		if !strings.Contains(buffer.String(), `Content-Type: application/octet-stream; name="attachment"`) {
-			t.Errorf("Content-Type header not found for attachment. Mail: %s", buffer.String())
-		}
-	})
-	t.Run("message with a single file attached custom content-type", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		message := testMessage(t)
-		message.AttachFile("testdata/attachment.txt", WithFileContentType(TypeAppOctetStream))
-		msgwriter.writeMsg(message)
-		if msgwriter.err != nil {
-			t.Errorf("msgWriter failed to write: %s", msgwriter.err)
-		}
-		switch runtime.GOOS {
-		case "windows":
-			if !strings.Contains(buffer.String(), "VGhpcyBpcyBhIHRlc3QgYXR0YWNobWVudA0K") {
-				t.Errorf("attachment not found in mail message. Mail: %s", buffer.String())
-			}
-		default:
-			if !strings.Contains(buffer.String(), "VGhpcyBpcyBhIHRlc3QgYXR0YWNobWVudAo=") {
-				t.Errorf("attachment not found in mail message. Mail: %s", buffer.String())
-			}
-		}
-		if !strings.Contains(buffer.String(), `Content-Disposition: attachment; filename="attachment.txt"`) {
-			t.Errorf("Content-Dispositon header not found for attachment. Mail: %s", buffer.String())
-		}
-		if !strings.Contains(buffer.String(), `Content-Type: application/octet-stream; name="attachment.txt"`) {
-			t.Errorf("Content-Type header not found for attachment. Mail: %s", buffer.String())
-		}
-	})
-	t.Run("message with a single file attached custom transfer-encoding", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		message := testMessage(t)
-		message.AttachFile("testdata/attachment.txt", WithFileEncoding(EncodingUSASCII))
-		msgwriter.writeMsg(message)
-		if msgwriter.err != nil {
-			t.Errorf("msgWriter failed to write: %s", msgwriter.err)
-		}
-		if !strings.Contains(buffer.String(), "\r\n\r\nThis is a test attachment") {
-			t.Errorf("attachment not found in mail message. Mail: %s", buffer.String())
-		}
-		if !strings.Contains(buffer.String(), `Content-Disposition: attachment; filename="attachment.txt"`) {
-			t.Errorf("Content-Dispositon header not found for attachment. Mail: %s", buffer.String())
-		}
-		switch runtime.GOOS {
-		case "freebsd":
-			if !strings.Contains(buffer.String(), `Content-Type: application/octet-stream; name="attachment.txt"`) {
-				t.Errorf("Content-Type header not found for attachment. Mail: %s", buffer.String())
-			}
-		default:
-			if !strings.Contains(buffer.String(), `Content-Type: text/plain; charset=utf-8; name="attachment.txt"`) {
-				t.Errorf("Content-Type header not found for attachment. Mail: %s", buffer.String())
-			}
-		}
-		if !strings.Contains(buffer.String(), `Content-Transfer-Encoding: 7bit`) {
-			t.Errorf("Content-Transfer-Encoding header not found for attachment. Mail: %s", buffer.String())
-		}
-	})
-	t.Run("message with a single file attached custom description", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		message := testMessage(t)
-		message.AttachFile("testdata/attachment.txt", WithFileDescription("Testdescription"))
-		msgwriter.writeMsg(message)
-		if msgwriter.err != nil {
-			t.Errorf("msgWriter failed to write: %s", msgwriter.err)
-		}
-		switch runtime.GOOS {
-		case "windows":
-			if !strings.Contains(buffer.String(), "VGhpcyBpcyBhIHRlc3QgYXR0YWNobWVudA0K") {
-				t.Errorf("attachment not found in mail message. Mail: %s", buffer.String())
-			}
-		default:
-			if !strings.Contains(buffer.String(), "VGhpcyBpcyBhIHRlc3QgYXR0YWNobWVudAo=") {
-				t.Errorf("attachment not found in mail message. Mail: %s", buffer.String())
-			}
-		}
-		if !strings.Contains(buffer.String(), `Content-Disposition: attachment; filename="attachment.txt"`) {
-			t.Errorf("Content-Dispositon header not found for attachment. Mail: %s", buffer.String())
-		}
-		switch runtime.GOOS {
-		case "freebsd":
-			if !strings.Contains(buffer.String(), `Content-Type: application/octet-stream; name="attachment.txt"`) {
-				t.Errorf("Content-Type header not found for attachment. Mail: %s", buffer.String())
-			}
-		default:
-			if !strings.Contains(buffer.String(), `Content-Type: text/plain; charset=utf-8; name="attachment.txt"`) {
-				t.Errorf("Content-Type header not found for attachment. Mail: %s", buffer.String())
-			}
-		}
-		if !strings.Contains(buffer.String(), `Content-Transfer-Encoding: base64`) {
-			t.Errorf("Content-Transfer-Encoding header not found for attachment. Mail: %s", buffer.String())
-		}
-		if !strings.Contains(buffer.String(), `Content-Description: Testdescription`) {
-			t.Errorf("Content-Description header not found for attachment. Mail: %s", buffer.String())
-		}
-	})
-	t.Run("message with attachment but no body part", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		message := testMessage(t)
-		message.parts = nil
-		message.AttachFile("testdata/attachment.txt")
-		msgwriter.writeMsg(message)
-		if msgwriter.err != nil {
-			t.Errorf("msgWriter failed to write: %s", msgwriter.err)
-		}
-		switch runtime.GOOS {
-		case "windows":
-			if !strings.Contains(buffer.String(), "VGhpcyBpcyBhIHRlc3QgYXR0YWNobWVudA0K") {
-				t.Errorf("attachment not found in mail message. Mail: %s", buffer.String())
-			}
-		default:
-			if !strings.Contains(buffer.String(), "VGhpcyBpcyBhIHRlc3QgYXR0YWNobWVudAo=") {
-				t.Errorf("attachment not found in mail message. Mail: %s", buffer.String())
-			}
-		}
-		if !strings.Contains(buffer.String(), `Content-Disposition: attachment; filename="attachment.txt"`) {
-			t.Errorf("Content-Dispositon header not found for attachment. Mail: %s", buffer.String())
-		}
-		switch runtime.GOOS {
-		case "freebsd":
-			if !strings.Contains(buffer.String(), `Content-Type: application/octet-stream; name="attachment.txt"`) {
-				t.Errorf("Content-Type header not found for attachment. Mail: %s", buffer.String())
-			}
-		default:
-			if !strings.Contains(buffer.String(), `Content-Type: text/plain; charset=utf-8; name="attachment.txt"`) {
-				t.Errorf("Content-Type header not found for attachment. Mail: %s", buffer.String())
-			}
-		}
-		if !strings.Contains(buffer.String(), `Content-Transfer-Encoding: base64`) {
-			t.Errorf("Content-Transfer-Encoding header not found for attachment. Mail: %s", buffer.String())
-		}
-	})
-}

-func TestMsgWriter_writePart(t *testing.T) {
-	msgwriter := &msgWriter{
-		charset: CharsetUTF8,
-		encoder: getEncoder(EncodingQP),
+	m = NewMsg(WithPGPType(PGPSignature))
+	_ = m.From(`"Toni Tester" <test@example.com>`)
+	_ = m.To(`"Toni Receiver" <receiver@example.com>`)
+	m.Subject("This is a subject")
+	m.SetBodyString(TypeTextPlain, "This is the body")
+	buf = bytes.Buffer{}
+	mw = &msgWriter{writer: &buf, charset: CharsetUTF8, encoder: mime.QEncoding}
+	mw.writeMsg(m)
+	ms = buf.String()
+	if !strings.Contains(ms, `signed; protocol="application/pgp-signature"`) {
+		t.Errorf("writeMsg failed. Expected PGP encoding header but didn't find it in message output")
 	}
-	t.Run("message with no part charset should use default message charset", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		message := testMessage(t, WithCharset(CharsetUTF7))
-		message.AddAlternativeString(TypeTextPlain, "thisisatest")
-		message.parts[1].charset = ""
-		msgwriter.writeMsg(message)
-		if msgwriter.err != nil {
-			t.Errorf("msgWriter failed to write: %s", msgwriter.err)
-		}
-		if !strings.Contains(buffer.String(), "ontent-Type: text/plain; charset=UTF-7\r\n\r\nTestmail") {
-			t.Errorf("part not found in mail message. Mail: %s", buffer.String())
-		}
-		if !strings.Contains(buffer.String(), "ontent-Type: text/plain; charset=UTF-7\r\n\r\nthisisatest") {
-			t.Errorf("part not found in mail message. Mail: %s", buffer.String())
-		}
-	})
-	t.Run("message with parts that have a description", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		message := testMessage(t)
-		message.AddAlternativeString(TypeTextPlain, "thisisatest")
-		message.parts[1].description = "thisisadescription"
-		msgwriter.writeMsg(message)
-		if msgwriter.err != nil {
-			t.Errorf("msgWriter failed to write: %s", msgwriter.err)
-		}
-		if !strings.Contains(buffer.String(), "Content-Description: thisisadescription") {
-			t.Errorf("part description not found in mail message. Mail: %s", buffer.String())
-		}
-	})
-}
-
-func TestMsgWriter_writeString(t *testing.T) {
-	msgwriter := &msgWriter{
-		charset: CharsetUTF8,
-		encoder: getEncoder(EncodingQP),
-	}
-	t.Run("writeString succeeds", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		msgwriter.writeString("thisisatest")
-		if !strings.EqualFold(buffer.String(), "thisisatest") {
-			t.Errorf("writeString failed, expected: thisisatest got: %s", buffer.String())
-		}
-	})
-	t.Run("writeString fails", func(t *testing.T) {
-		msgwriter.writer = failReadWriteSeekCloser{}
-		msgwriter.writeString("thisisatest")
-		if msgwriter.err == nil {
-			t.Errorf("writeString succeeded, expected error")
-		}
-	})
-	t.Run("writeString on errored writer should return", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		msgwriter.err = errors.New("intentional error")
-		msgwriter.writeString("thisisatest")
-		if !strings.EqualFold(buffer.String(), "") {
-			t.Errorf("writeString succeeded, expected: empty string, got: %s", buffer.String())
-		}
-	})
-}
-
-func TestMsgWriter_writeHeader(t *testing.T) {
-	msgwriter := &msgWriter{
-		charset: CharsetUTF8,
-		encoder: getEncoder(EncodingQP),
-	}
-	t.Run("writeHeader with single value", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		msgwriter.writeHeader(HeaderMessageID, "this.is.a.test")
-		if !strings.EqualFold(buffer.String(), "Message-ID: this.is.a.test\r\n") {
-			t.Errorf("writeHeader failed, expected: %s, got: %s", "Message-ID: this.is.a.test",
-				buffer.String())
-		}
-	})
-	t.Run("writeHeader with multiple values", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		msgwriter.writeHeader(HeaderMessageID, "this.is.a.test", "this.as.well")
-		if !strings.EqualFold(buffer.String(), "Message-ID: this.is.a.test, this.as.well\r\n") {
-			t.Errorf("writeHeader failed, expected: %s, got: %s", "Message-ID: this.is.a.test, this.as.well",
-				buffer.String())
-		}
-	})
-	t.Run("writeHeader with no values", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		msgwriter.writeHeader(HeaderMessageID)
-		// While technically it is permitted to have empty headers, it's recommend to omit them if
-		// no value is present. We follow this recommendation.
-		if !strings.EqualFold(buffer.String(), "") {
-			t.Errorf("writeHeader failed, expected: %s, got: %s", "", buffer.String())
-		}
-	})
-	t.Run("writeHeader with very long value", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		msgwriter.writeHeader(HeaderMessageID, strings.Repeat("a", MaxHeaderLength-13), "next-row")
-		want := "Message-ID:\r\n " + strings.Repeat("a", MaxHeaderLength-13) + ",\r\n next-row\r\n"
-		if !strings.EqualFold(buffer.String(), want) {
-			t.Errorf("writeHeader failed, expected: %s, got: %s", want, buffer.String())
-		}
-	})
-}
-
-func TestMsgWriter_writeBody(t *testing.T) {
-	t.Log("We only cover some edge-cases here, most of the functionality is tested already very thoroughly.")
-
-	msgwriter := &msgWriter{
-		charset: CharsetUTF8,
-		encoder: getEncoder(EncodingQP),
-	}
-	t.Run("writeBody on NoEncoding", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		message := testMessage(t)
-		msgwriter.writeBody(message.parts[0].writeFunc, NoEncoding, false)
-		if msgwriter.err != nil {
-			t.Errorf("writeBody failed to write: %s", msgwriter.err)
-		}
-	})
-	t.Run("writeBody on NoEncoding fails on write", func(t *testing.T) {
-		msgwriter.writer = failReadWriteSeekCloser{}
-		message := testMessage(t)
-		msgwriter.writeBody(message.parts[0].writeFunc, NoEncoding, false)
-		if msgwriter.err == nil {
-			t.Errorf("writeBody succeeded, expected error")
-		}
-		if !strings.EqualFold(msgwriter.err.Error(), "bodyWriter io.Copy: intentional write failure") {
-			t.Errorf("expected error: bodyWriter io.Copy: intentional write failure, got: %s", msgwriter.err)
-		}
-	})
-	t.Run("writeBody on NoEncoding fails on writeFunc", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		writeFunc := func(io.Writer) (int64, error) {
-			return 0, errors.New("intentional write failure")
-		}
-		msgwriter.writeBody(writeFunc, NoEncoding, false)
-		if msgwriter.err == nil {
-			t.Errorf("writeBody succeeded, expected error")
-		}
-		if !strings.EqualFold(msgwriter.err.Error(), "bodyWriter function: intentional write failure") {
-			t.Errorf("expected error: bodyWriter function: intentional write failure, got: %s", msgwriter.err)
-		}
-	})
-	t.Run("writeBody Quoted-Printable fails on write", func(t *testing.T) {
-		msgwriter.writer = failReadWriteSeekCloser{}
-		message := testMessage(t)
-		msgwriter.writeBody(message.parts[0].writeFunc, EncodingQP, false)
-		if msgwriter.err == nil {
-			t.Errorf("writeBody succeeded, expected error")
-		}
-		if !strings.EqualFold(msgwriter.err.Error(), "bodyWriter function: intentional write failure") {
-			t.Errorf("expected error: bodyWriter function: intentional write failure, got: %s", msgwriter.err)
-		}
-	})
-	t.Run("writeBody Quoted-Printable fails on writeFunc", func(t *testing.T) {
-		buffer := bytes.NewBuffer(nil)
-		msgwriter.writer = buffer
-		writeFunc := func(io.Writer) (int64, error) {
-			return 0, errors.New("intentional write failure")
-		}
-		msgwriter.writeBody(writeFunc, EncodingQP, false)
-		if msgwriter.err == nil {
-			t.Errorf("writeBody succeeded, expected error")
-		}
-		if !strings.EqualFold(msgwriter.err.Error(), "bodyWriter function: intentional write failure") {
-			t.Errorf("expected error: bodyWriter function: intentional write failure, got: %s", msgwriter.err)
-		}
-	})
 }

 // TestMsgWriter_writeMsg_SMime tests the writeMsg method of the msgWriter with S/MIME types set
--- a/smtp/smtp.go
+++ b/smtp/smtp.go
@ -554,9 +554,9 @@ func (c *Client) Noop() error {

 // Quit sends the QUIT command and closes the connection to the server.
 func (c *Client) Quit() error {
-	// See https://github.com/golang/go/issues/70011
-	_ = c.hello() // ignore error; we're quitting anyhow
-
+	if err := c.hello(); err != nil {
+		return err
+	}
 	_, _, err := c.cmd(221, "QUIT")
 	if err != nil {
 		return err
--- a/smtp/smtp_test.go
+++ b/smtp/smtp_test.go
@ -900,35 +900,6 @@ Goodbye.
 QUIT
 `

-func TestHELOFailed(t *testing.T) {
-	serverLines := `502 EH?
-502 EH?
-221 OK
-`
-	clientLines := `EHLO localhost
-HELO localhost
-QUIT
-`
-	server := strings.Join(strings.Split(serverLines, "\n"), "\r\n")
-	client := strings.Join(strings.Split(clientLines, "\n"), "\r\n")
-	var cmdbuf strings.Builder
-	bcmdbuf := bufio.NewWriter(&cmdbuf)
-	var fake faker
-	fake.ReadWriter = bufio.NewReadWriter(bufio.NewReader(strings.NewReader(server)), bcmdbuf)
-	c := &Client{Text: textproto.NewConn(fake), localName: "localhost"}
-	if err := c.Hello("localhost"); err == nil {
-		t.Fatal("expected EHLO to fail")
-	}
-	if err := c.Quit(); err != nil {
-		t.Errorf("QUIT failed: %s", err)
-	}
-	_ = bcmdbuf.Flush()
-	actual := cmdbuf.String()
-	if client != actual {
-		t.Errorf("Got:\n%s\nWant:\n%s", actual, client)
-	}
-}
-
 func TestExtensions(t *testing.T) {
 	fake := func(server string) (c *Client, bcmdbuf *bufio.Writer, cmdbuf *strings.Builder) {
 		server = strings.Join(strings.Split(server, "\n"), "\r\n")
--- a/testdata/RFC5322-A1-1-invalid-from.eml
+++ b/testdata/RFC5322-A1-1-invalid-from.eml
@ -1,8 +0,0 @@
-From: §§§§§§§§
-To: Mary Smith <mary@example.net>
-Subject: Saying Hello
-Date: Fri, 21 Nov 1997 09:55:06 -0600
-Message-ID: <1234@local.machine.example>
-
-This is a message just to say hello.
-So, "Hello".
--- a/testdata/RFC5322-A1-1-invalid-from.eml.license
+++ b/testdata/RFC5322-A1-1-invalid-from.eml.license
@ -1,3 +0,0 @@
-// SPDX-FileCopyrightText: Copyright (c) 2022-2024 The go-mail Authors
-//
-// SPDX-License-Identifier: MIT
--- a/testdata/RFC5322-A1-1.eml
+++ b/testdata/RFC5322-A1-1.eml
@ -1,8 +0,0 @@
-From: John Doe <jdoe@machine.example>
-To: Mary Smith <mary@example.net>
-Subject: Saying Hello
-Date: Fri, 21 Nov 1997 09:55:06 -0600
-Message-ID: <1234@local.machine.example>
-
-This is a message just to say hello.
-So, "Hello".
--- a/testdata/RFC5322-A1-1.eml.license
+++ b/testdata/RFC5322-A1-1.eml.license
@ -1,3 +0,0 @@
-// SPDX-FileCopyrightText: Copyright (c) 2022-2024 The go-mail Authors
-//
-// SPDX-License-Identifier: MIT
--- a/testdata/attachment
+++ b/testdata/attachment
@ -1 +0,0 @@
-This is a test attachment
--- a/testdata/attachment.license
+++ b/testdata/attachment.license
@ -1,3 +0,0 @@
-// SPDX-FileCopyrightText: Copyright (c) 2022-2024 The go-mail Authors
-//
-// SPDX-License-Identifier: MIT
--- a/testdata/attachment.txt
+++ b/testdata/attachment.txt
@ -1 +0,0 @@
-This is a test attachment
--- a/testdata/attachment.txt.license
+++ b/testdata/attachment.txt.license
@ -1,3 +0,0 @@
-// SPDX-FileCopyrightText: Copyright (c) 2022-2024 The go-mail Authors
-//
-// SPDX-License-Identifier: MIT
--- a/testdata/embed.txt
+++ b/testdata/embed.txt
@ -1 +0,0 @@
-This is a test embed
--- a/testdata/embed.txt.license
+++ b/testdata/embed.txt.license
@ -1,3 +0,0 @@
-// SPDX-FileCopyrightText: Copyright (c) 2022-2024 The go-mail Authors
-//
-// SPDX-License-Identifier: MIT
--- a/testdata/logo.svg
+++ b/testdata/logo.svg
--- a/testdata/logo.svg.base64
+++ b/testdata/logo.svg.base64
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--- a/testdata/logo.svg.base64.license
+++ b/testdata/logo.svg.base64.license
@ -1,3 +0,0 @@
-SPDX-FileCopyrightText: 2022 Maria Letta, the go-mail Team
-
-SPDX-License-Identifier: CC-BY-ND-4.0
--- a/testdata/logo.svg.license
+++ b/testdata/logo.svg.license
@ -1,3 +0,0 @@
-SPDX-FileCopyrightText: 2022 Maria Letta, the go-mail Team
-
-SPDX-License-Identifier: CC-BY-ND-4.0
--- a/testdata/tmp/.gitkeep
+++ b/testdata/tmp/.gitkeep
--- a/util_test.go
+++ b/util_test.go
@ -19,7 +19,7 @@ const (
 	keyECDSAFilePath  = "dummy-child-key-ecdsa.pem"
 )

-// getDummyRSACryptoMaterial loads a certificate (RSA), the associated private key and certificate (RSA) is loaded from local disk for testing purposes
+// getDummyRSACryptoMaterial loads a certificate (RSA) and the associated private key (ECDSA) form local disk for testing purposes
 func getDummyRSACryptoMaterial() (*rsa.PrivateKey, *x509.Certificate, *x509.Certificate, error) {
 	keyPair, err := tls.LoadX509KeyPair(certRSAFilePath, keyRSAFilePath)
 	if err != nil {
@ -41,7 +41,7 @@ func getDummyRSACryptoMaterial() (*rsa.PrivateKey, *x509.Certificate, *x509.Cert
 	return privateKey, certificate, intermediateCertificate, nil
 }

-// getDummyECDSACryptoMaterial loads a certificate (ECDSA), the associated private key and certificate (ECDSA) is loaded from local disk for testing purposes
+// getDummyECDSACryptoMaterial loads a certificate (ECDSA) and the associated private key (ECDSA) form local disk for testing purposes
 func getDummyECDSACryptoMaterial() (*ecdsa.PrivateKey, *x509.Certificate, *x509.Certificate, error) {
 	keyPair, err := tls.LoadX509KeyPair(certECDSAFilePath, keyECDSAFilePath)
 	if err != nil {
@ -62,12 +62,3 @@ func getDummyECDSACryptoMaterial() (*ecdsa.PrivateKey, *x509.Certificate, *x509.

 	return privateKey, certificate, intermediateCertificate, nil
 }
-
-// getDummyKeyPairTLS loads a certificate (ECDSA) as *tls.Certificate, the associated private key and certificate (ECDSA) is loaded from local disk for testing purposes
-func getDummyKeyPairTLS() (*tls.Certificate, error) {
-	keyPair, err := tls.LoadX509KeyPair(certECDSAFilePath, keyECDSAFilePath)
-	if err != nil {
-		return nil, err
-	}
-	return &keyPair, err
-}