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📧 Easy to use, yet comprehensive library for sending mails with Go https://go-mail.dev
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Winni Neessen 0ea9631855
Refactor error handling in message delivery process 
The error handling process in sending messages has been refactored for better accuracy and efficiency. Instead of immediately joining errors and returning, they are now collected in a slice and joined in a deferred function to ensure all errors are captured before being returned. Furthermore, the SendError structure has been updated to include a reference to the affected message, providing better context for each error.
2024-07-16 13:07:20 +02:00
.github Bump github/codeql-action from 3.25.10 to 3.25.11 2024-07-01 13:44:21 +00:00
.reuse #24: Add SPDX license IDs for REUSE compliance 2022-06-17 15:05:54 +02:00
assets Switch logo to CC-BY-ND-4.0 license 2022-07-11 13:23:50 +02:00
LICENSES Fix license SPDX headers for forked net/smtp code 2023-01-10 10:09:45 +01:00
log Refactor variable names in log files 2024-02-27 11:35:37 +01:00
smtp Sync with upstream 2024-05-24 18:50:27 +02:00
.cirrus.yml Update FreeBSD version in .cirrus.yml 2024-01-23 12:31:30 +01:00
.gitignore Ignore testdata in Git 2024-03-23 16:36:01 +01:00
.golangci.toml Update Go version and clean up SMTP test suite 2024-02-08 16:51:25 +01:00
auth.go Update SMTP authentication mechanisms and related tests 2024-02-22 15:24:19 +01:00
b64linebreaker.go Refactor variable and function names for improved clarity in b64linebreaker.go 2024-02-24 21:38:20 +01:00
b64linebreaker_test.go Rename error variables in b64linebreaker_test.go 2024-03-24 22:26:15 +01:00
client.go Refine SMTP port selection and fallback logic 2024-04-06 16:49:34 +02:00
client_119.go Refactor variable names in client_119.go 2024-02-27 11:10:49 +01:00
client_120.go Refactor error handling in message delivery process 2024-07-16 13:07:20 +02:00
client_test.go Refactor variable names in SMTP client code 2024-02-24 22:06:18 +01:00
CODE_OF_CONDUCT.md #24: Add SPDX license IDs for REUSE compliance 2022-06-17 15:05:54 +02:00
codecov.yml Switched copyright header from me to "The go-mail Authors" 2023-01-15 16:14:19 +01:00
CONTRIBUTING.md Switched copyright header from me to "The go-mail Authors" 2023-01-15 16:14:19 +01:00
doc.go Bump version to 0.4.2 2024-06-28 13:53:00 +02:00
doc_test.go Switched copyright header from me to "The go-mail Authors" 2023-01-15 16:14:19 +01:00
eml.go Rename WithContentID to WithFileContentID 2024-06-28 13:49:21 +02:00
eml_test.go Add error handling for writing EML string to temp file 2024-06-28 13:59:08 +02:00
encoding.go Add new content types and refactor message writer 2024-02-10 13:36:42 +01:00
encoding_test.go Add new content types and refactor message writer 2024-02-10 13:36:42 +01:00
file.go Rename WithContentID to WithFileContentID 2024-06-28 13:49:21 +02:00
file_test.go Add test for WithFileContentID option 2024-06-28 13:49:34 +02:00
go.mod Switched copyright header from me to "The go-mail Authors" 2023-01-15 16:14:19 +01:00
go.sum Forgot to update go.mod/.sum 2022-03-13 17:25:57 +01:00
header.go Merge branch 'main' into feature/145_add-eml-parser-to-generate-msg-from-eml-files 2024-02-08 17:04:06 +01:00
header_test.go Add References header field and improve string methods 2023-10-13 15:06:54 +02:00
LICENSE Switched copyright header from me to "The go-mail Authors" 2023-01-15 16:14:19 +01:00
msg.go Add GetBoundary method and corresponding test 2024-07-02 10:58:13 +02:00
msg_nowin_test.go Switched copyright header from me to "The go-mail Authors" 2023-01-15 16:14:19 +01:00
msg_test.go Add GetBoundary method and corresponding test 2024-07-02 10:58:13 +02:00
msg_totmpfile.go Switched copyright header from me to "The go-mail Authors" 2023-01-15 16:14:19 +01:00
msg_totmpfile_116.go Switched copyright header from me to "The go-mail Authors" 2023-01-15 16:14:19 +01:00
msgwriter.go Revert after successful merge 2024-05-16 15:18:26 +02:00
msgwriter_test.go Refactor SMTP client code for better readability 2024-02-24 12:43:01 +01:00
part.go Refactor variable names for code readability 2024-02-27 11:21:28 +01:00
part_test.go Refactor variable names for code readability 2024-02-27 11:21:28 +01:00
random.go Update variable name in random.go 2024-02-27 11:43:05 +01:00
random_test.go Switched copyright header from me to "The go-mail Authors" 2023-01-15 16:14:19 +01:00
reader.go Refactor variable names for readability in reader.go 2024-02-26 00:56:29 +01:00
reader_test.go Refactor variable names for readability in reader.go 2024-02-26 00:56:29 +01:00
README.md Add EML file support to go-mail in README 2024-06-28 13:51:49 +02:00
SECURITY.md Added GPG key to SECURITY.md 2023-01-15 22:40:28 +01:00
senderror.go Refactor error handling in message delivery process 2024-07-16 13:07:20 +02:00
senderror_test.go Switched copyright header from me to "The go-mail Authors" 2023-01-15 16:14:19 +01:00
sonar-project.properties Switched copyright header from me to "The go-mail Authors" 2023-01-15 16:14:19 +01:00
tls.go Fix typos in comments in tls.go 2024-02-24 21:46:48 +01:00
tls_test.go Switched copyright header from me to "The go-mail Authors" 2023-01-15 16:14:19 +01:00

README.md

go-mail - Easy to use, yet comprehensive library for sending mails with Go

GoDoc codecov Go Report Card Mentioned in Awesome Go #go-mail on Discord REUSE status OpenSSF Best Practices OpenSSF Scorecard buy ma a coffee

go-mail logo

The main idea of this library was to provide a simple interface to sending mails for my JS-Mailer project. It quickly evolved into a full-fledged mail library.

go-mail follows idiomatic Go style and best practice. It's only dependency is the Go Standard Library. It combines a lot of functionality from the standard library to give easy and convenient access to mail and SMTP related tasks.

Parts of this library (especially some parts of msgwriter.go) have been forked/ported from the go-mail/mail respectively go-gomail/gomail which both seems to not be maintained anymore.

The smtp package of go-mail is forked from the original Go stdlib's net/smtp and then extended by the go-mail team.

Features

Some of the features of this library:

  • Only Standard Library dependant
  • Modern, idiomatic Go
  • Sane and secure defaults
  • Explicit SSL/TLS support
  • Implicit StartTLS support with different policies
  • Makes use of contexts for a better control flow and timeout/cancelation handling
  • SMTP Auth support (LOGIN, PLAIN, CRAM-MD, XOAUTH2)
  • RFC5322 compliant mail address validation
  • Support for common mail header field generation (Message-ID, Date, Bulk-Precedence, Priority, etc.)
  • Reusing the same SMTP connection to send multiple mails
  • Support for attachments and inline embeds (from file system, io.Reader or embed.FS)
  • Support for different encodings
  • Middleware support for 3rd-party libraries to alter mail messages
  • Support sending mails via a local sendmail command
  • Support for requestng MDNs (RFC 8098) and DSNs (RFC 1891)
  • DKIM signature support via go-mail-middlware
  • Message object satisfies io.WriteTo and io.Reader interfaces
  • Support for Go's html/template and text/template (as message body, alternative part or attachment/emebed)
  • Output to file support which allows storing mail messages as e. g. .eml files to disk to open them in a MUA
  • Debug logging of SMTP traffic
  • Custom error types for delivery errors
  • Custom dial-context functions for more control over the connection (proxing, DNS hooking, etc.)
  • Output a go-mail message as EML file and parse EML file into a go-mail message

go-mail works like a programatic email client and provides lots of methods and functionalities you would consider standard in a MUA.

Documentation

We aim for good GoDoc documenation in our library which gives you a full API reference. We also provide a more in-depth documentation website at go-mail.dev

Compatibility

Go is growing fast and providing great features with every new release. While we'd love to adopt the latest Go features into our code, we realize that not everybody using this package can run the latest Go versions. Therefore we try to implement alternative solutions for Go versions that do not support these features. Yet, the work needed to maintain the separate versions is not to be underestimated. For that reason, we might retire that code at some point. We guarantee that go-mail will always support the last four releases of Go. With two Go releases per year, this gives the user a timeframe of two years to update to the next or even the latest version of Go.

Support

We have a support and general discussion channel on Discord. Find us at: #go-mail

Middleware

The goal of go-mail is to keep it free from 3rd party dependencies and only focus on things a mail library should fulfill. Yet, since version v0.2.8 we've added support for middleware on the Msg object, allowing 3rd parties to alter a given mail message to their needs without relying on go-mail to support their specific need.

To get our users started with message middleware, we've created a collection of useful middlewares. It can be found in a seperate repository: go-mail-middlware.

Merch

Thanks to our wonderful friends at HelloTux we can offer great go-mail merchandising. All merch articles are embroidery to provide the best and most long-lasting quality possible.

If you want to support the open source community and represent your favourite Go mail library with some cool drip, check out our merch shop at: https://www.hellotux.com/go-mail.

Examples

We provide example code in both our GoDocs as well as on our official Website (see Documentation). For a quick start into go-mail check out our Getting started guide.

Authors/Contributors

go-mail was initially authored and developed by Winni Neessen.

Big thanks to the following people, for contributing to the go-mail project (either in form of code or by reviewing code, writing documenation or helping to translate the website):