.github/workflows/codecov.yml

@@ -39,7 +39,7 @@ jobs:
         go: ['1.20', '1.21', '1.22', '1.23']
     steps:
     - name: Harden Runner
-      uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
+      uses: step-security/harden-runner@5c7944e73c4c2a096b17a9cb74d65b6c2bbafbde # v2.9.1
       with:
         egress-policy: audit
 

.github/workflows/codeql-analysis.yml

@@ -45,7 +45,7 @@ jobs:
 
     steps:
     - name: Harden Runner
-      uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
+      uses: step-security/harden-runner@5c7944e73c4c2a096b17a9cb74d65b6c2bbafbde # v2.9.1
       with:
         egress-policy: audit
 
@@ -54,7 +54,7 @@ jobs:
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@8214744c546c1e5c8f03dde8fab3a7353211988d # v3.26.7
+      uses: github/codeql-action/init@4dd16135b69a43b6c8efb853346f8437d92d3c93 # v3.26.6
       with:
         languages: ${{ matrix.language }}
         # If you wish to specify custom queries, you can do so here or in a config file.
@@ -65,7 +65,7 @@ jobs:
     # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
     # If this step fails, then you should remove it and run the build manually (see below)
     - name: Autobuild
-      uses: github/codeql-action/autobuild@8214744c546c1e5c8f03dde8fab3a7353211988d # v3.26.7
+      uses: github/codeql-action/autobuild@4dd16135b69a43b6c8efb853346f8437d92d3c93 # v3.26.6
 
     # ℹ️ Command-line programs to run using the OS shell.
     # 📚 https://git.io/JvXDl
@@ -79,4 +79,4 @@ jobs:
     #   make release
 
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@8214744c546c1e5c8f03dde8fab3a7353211988d # v3.26.7
+      uses: github/codeql-action/analyze@4dd16135b69a43b6c8efb853346f8437d92d3c93 # v3.26.6

.github/workflows/dependency-review.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Harden Runner
-        uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
+        uses: step-security/harden-runner@5c7944e73c4c2a096b17a9cb74d65b6c2bbafbde # v2.9.1
         with:
           egress-policy: audit
 

.github/workflows/golangci-lint.yml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Harden Runner
-        uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
+        uses: step-security/harden-runner@5c7944e73c4c2a096b17a9cb74d65b6c2bbafbde # v2.9.1
         with:
           egress-policy: audit
 

.github/workflows/govulncheck.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps: 
     - name: Harden Runner
-      uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
+      uses: step-security/harden-runner@5c7944e73c4c2a096b17a9cb74d65b6c2bbafbde # v2.9.1
       with:
         egress-policy: audit
     - name: Run govulncheck

.github/workflows/reuse.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps: 
     - name: Harden Runner
-      uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
+      uses: step-security/harden-runner@5c7944e73c4c2a096b17a9cb74d65b6c2bbafbde # v2.9.1
       with:
         egress-policy: audit
 

.github/workflows/scorecards.yml

@@ -35,7 +35,7 @@ jobs:
 
     steps:
       - name: Harden Runner
-        uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
+        uses: step-security/harden-runner@5c7944e73c4c2a096b17a9cb74d65b6c2bbafbde # v2.9.1
         with:
           egress-policy: audit
 
@@ -75,6 +75,6 @@ jobs:
 
       # Upload the results to GitHub's code scanning dashboard.
       - name: "Upload to code-scanning"
-        uses: github/codeql-action/upload-sarif@8214744c546c1e5c8f03dde8fab3a7353211988d # v3.26.7
+        uses: github/codeql-action/upload-sarif@4dd16135b69a43b6c8efb853346f8437d92d3c93 # v3.26.6
         with:
           sarif_file: results.sarif

.github/workflows/sonarqube.yml

@@ -27,7 +27,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Harden Runner
-        uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
+        uses: step-security/harden-runner@5c7944e73c4c2a096b17a9cb74d65b6c2bbafbde # v2.9.1
         with:
           egress-policy: audit
 

client_120.go

@@ -24,33 +24,28 @@ func (c *Client) Send(messages ...*Msg) (returnErr error) {
 		returnErr = errors.Join(errs...)
 	}()
 
-	for id, message := range messages {
-		if sendErr := c.sendSingleMsg(message); sendErr != nil {
-			messages[id].sendError = sendErr
-			errs = append(errs, sendErr)
-		}
-	}
-
-	return
-}
-
-// sendSingleMsg sends out a single message and returns an error if the transmission/delivery fails.
-// It is invoked by the public Send methods
-func (c *Client) sendSingleMsg(message *Msg) error {
+	for msgid, message := range messages {
+		message.sendError = nil
 		if message.encoding == NoEncoding {
 			if ok, _ := c.smtpClient.Extension("8BITMIME"); !ok {
-			return &SendError{Reason: ErrNoUnencoded, isTemp: false}
+				message.sendError = &SendError{Reason: ErrNoUnencoded, isTemp: false}
+				errs = append(errs, message.sendError)
+				continue
 			}
 		}
 		from, err := message.GetSender(false)
 		if err != nil {
-		return &SendError{Reason: ErrGetSender, errlist: []error{err}, isTemp: isTempError(err),
-			affectedMsg: message}
+			message.sendError = &SendError{Reason: ErrGetSender, errlist: []error{err}, isTemp: isTempError(err),
+				affectedMsg: messages[msgid]}
+			errs = append(errs, message.sendError)
+			continue
 		}
 		rcpts, err := message.GetRecipients()
 		if err != nil {
-		return &SendError{Reason: ErrGetRcpts, errlist: []error{err}, isTemp: isTempError(err),
-			affectedMsg: message}
+			message.sendError = &SendError{Reason: ErrGetRcpts, errlist: []error{err}, isTemp: isTempError(err),
+				affectedMsg: messages[msgid]}
+			errs = append(errs, message.sendError)
+			continue
 		}
 
 		if c.dsn {
@@ -59,11 +54,12 @@ func (c *Client) sendSingleMsg(message *Msg) error {
 			}
 		}
 		if err = c.smtpClient.Mail(from); err != nil {
-		retError := &SendError{Reason: ErrSMTPMailFrom, errlist: []error{err}, isTemp: isTempError(err)}
+			message.sendError = &SendError{Reason: ErrSMTPMailFrom, errlist: []error{err}, isTemp: isTempError(err)}
+			errs = append(errs, message.sendError)
 			if resetSendErr := c.smtpClient.Reset(); resetSendErr != nil {
-			retError.errlist = append(retError.errlist, resetSendErr)
+				errs = append(errs, resetSendErr)
 			}
-		return retError
+			continue
 		}
 		failed := false
 		rcptSendErr := &SendError{}
@@ -82,29 +78,42 @@ func (c *Client) sendSingleMsg(message *Msg) error {
 		}
 		if failed {
 			if resetSendErr := c.smtpClient.Reset(); resetSendErr != nil {
-			rcptSendErr.errlist = append(rcptSendErr.errlist, resetSendErr)
+				errs = append(errs, resetSendErr)
 			}
-		return rcptSendErr
+			message.sendError = rcptSendErr
+			errs = append(errs, message.sendError)
+			continue
 		}
 		writer, err := c.smtpClient.Data()
 		if err != nil {
-		return &SendError{Reason: ErrSMTPData, errlist: []error{err}, isTemp: isTempError(err)}
+			message.sendError = &SendError{Reason: ErrSMTPData, errlist: []error{err}, isTemp: isTempError(err)}
+			errs = append(errs, message.sendError)
+			continue
 		}
 		_, err = message.WriteTo(writer)
 		if err != nil {
-		return &SendError{Reason: ErrWriteContent, errlist: []error{err}, isTemp: isTempError(err)}
+			message.sendError = &SendError{Reason: ErrWriteContent, errlist: []error{err}, isTemp: isTempError(err)}
+			errs = append(errs, message.sendError)
+			continue
 		}
 		message.isDelivered = true
 
 		if err = writer.Close(); err != nil {
-		return &SendError{Reason: ErrSMTPDataClose, errlist: []error{err}, isTemp: isTempError(err)}
+			message.sendError = &SendError{Reason: ErrSMTPDataClose, errlist: []error{err}, isTemp: isTempError(err)}
+			errs = append(errs, message.sendError)
+			continue
 		}
 
 		if err = c.Reset(); err != nil {
-		return &SendError{Reason: ErrSMTPReset, errlist: []error{err}, isTemp: isTempError(err)}
+			message.sendError = &SendError{Reason: ErrSMTPReset, errlist: []error{err}, isTemp: isTempError(err)}
+			errs = append(errs, message.sendError)
+			continue
 		}
 		if err = c.checkConn(); err != nil {
-		return &SendError{Reason: ErrConnCheck, errlist: []error{err}, isTemp: isTempError(err)}
+			message.sendError = &SendError{Reason: ErrConnCheck, errlist: []error{err}, isTemp: isTempError(err)}
+			errs = append(errs, message.sendError)
 		}
-	return nil
+	}
+
+	return
 }