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156 lines
6.9 KiB
Markdown
156 lines
6.9 KiB
Markdown
<!--
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SPDX-FileCopyrightText: 2022 Winni Neessen <winni@neessen.dev>
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SPDX-License-Identifier: CC0-1.0
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-->
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# go-mail - Simple and easy way to send mails in Go
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[](https://pkg.go.dev/github.com/wneessen/go-mail)
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[](https://codecov.io/gh/wneessen/go-mail)
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[](https://goreportcard.com/report/github.com/wneessen/go-mail)
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[](https://github.com/avelino/awesome-go) [](https://discord.gg/zSUeBrsFPB)
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[](https://api.reuse.software/info/github.com/wneessen/go-mail)
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<a href="https://ko-fi.com/D1D24V9IX"><img src="https://uploads-ssl.webflow.com/5c14e387dab576fe667689cf/5cbed8a4ae2b88347c06c923_BuyMeACoffee_blue.png" height="20" alt="buy ma a coffee"></a>
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<p align="center"><img src="./assets/gopher2.svg" width="250" alt="go-mail logo"/></p>
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The main idea of this library was to provide a simple interface to sending mails for
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my [JS-Mailer](https://github.com/wneessen/js-mailer) project. It quickly evolved into a full-fledged mail library.
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go-mail follows idiomatic Go style and best practice. It's only dependency is the Go Standard Library. It combines a lot
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of functionality from the standard library to give easy and convenient access to mail and SMTP related tasks.
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Parts of this library (especially some parts of [msgwriter.go](msgwriter.go)) have been forked/ported from the
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[go-mail/mail](https://github.com/go-mail/mail) respectively [go-gomail/gomail](https://github.com/go-gomail/gomail)
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which both seems to not be maintained anymore.
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## Features
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Some of the features of this library:
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* [X] Only Standard Library dependant
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* [X] Modern, idiomatic Go
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* [X] Sane and secure defaults
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* [X] Explicit SSL/TLS support
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* [X] Implicit StartTLS support with different policies
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* [X] Makes use of contexts for a better control flow and timeout/cancelation handling
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* [X] SMTP Auth support (LOGIN, PLAIN, CRAM-MD)
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* [X] RFC5322 compliant mail address validation
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* [X] Support for common mail header field generation (Message-ID, Date, Bulk-Precedence, Priority, etc.)
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* [X] Reusing the same SMTP connection to send multiple mails
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* [X] Support for attachments and inline embeds (from file system, `io.Reader` or `embed.FS`)
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* [X] Support for different encodings
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* [X] Middleware support for 3rd-party libraries to alter mail messages
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* [X] Support sending mails via a local sendmail command
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* [X] Support for requestng MDNs (RFC 8098) and DSNs (RFC 1891)
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* [X] DKIM signature support via [go-mail-middlware](https://github.com/wneessen/go-mail-middleware)
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* [X] Message object satisfies `io.WriteTo` and `io.Reader` interfaces
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* [X] Support for Go's `html/template` and `text/template` (as message body, alternative part or attachment/emebed)
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* [X] Output to file support which allows storing mail messages as e. g. `.eml` files to disk to open them in a MUA
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go-mail works like a programatic email client and provides lots of methods and functionalities you would consider
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standard in a MUA.
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## Support
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We have a support and general discussion channel on the Gophers Discord server. Find us at: [#go-mail](https://discord.gg/zSUeBrsFPB)
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## Middleware
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The goal of go-mail is to keep it free from 3rd party dependencies and only focus on things a mail library should
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fulfill. Yet, since version v0.2.8 we've added support for middleware on the `Msg` object, allowing 3rd parties to
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alter a given mail message to their needs without relying on `go-mail` to support their specific need.
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To get our users started with message middleware, we've created a collection of useful middlewares. It can be
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found in a seperate repository: [go-mail-middlware](https://github.com/wneessen/go-mail-middleware).
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## Examples
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The package is shipped with GoDoc example code for difference scenarios. Check them out on its
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[GoDoc page](https://pkg.go.dev/github.com/wneessen/go-mail#pkg-examples)
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For ease of use, here is a full usage example:
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```go
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package main
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import (
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"fmt"
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"github.com/wneessen/go-mail"
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"os"
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)
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func main() {
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// Create a new mail message
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m := mail.NewMsg()
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// To set address header fields like "From", "To", "Cc" or "Bcc" you have different methods
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// at your hands. Some perform input validation, some ignore invalid addresses. Some perform
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// the formating for you.
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//
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if err := m.FromFormat("Toni Tester", "sender@example.com"); err != nil {
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fmt.Printf("failed to set FROM address: %s\n", err)
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os.Exit(1)
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}
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if err := m.To(`"Max Mastermind <rcpt@example.com>"`); err != nil {
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fmt.Printf("failed to set TO address: %s\n", err)
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os.Exit(1)
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}
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m.CcIgnoreInvalid("cc@example.com", "invalidaddress+example.com")
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// Set a subject line
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m.Subject("This is a great email")
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// And some other common headers...
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//
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// Sets a valid "Date" header field with the current time
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m.SetDate()
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//
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// Generates a valid and unique "Message-ID"
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m.SetMessageID()
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//
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// Sets the "Precedence"-Header to "bulk" to indicate a "bulk mail"
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m.SetBulk()
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//
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// Set a "high" importance to the mail (this sets several Header fields to
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// satisfy the different common mail clients like Mail.app and Outlook)
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m.SetImportance(mail.ImportanceHigh)
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// Add your mail message to body
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m.SetBodyString(mail.TypeTextPlain, "This is a great message body text.")
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// Attach a file from your local FS
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// We override the attachment name using the WithFileName() Option
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m.AttachFile("/home/ttester/test.txt", mail.WithFileName("attachment.txt"))
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// Next let's create a Client
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// We have lots of With* options at our disposal to stear the Client. It will set sane
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// options by default, though
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//
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// Let's assume we need to perform SMTP AUTH with the sending server, though. Since we
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// use SMTP PLAIN AUTH, let's also make sure to enforce strong TLS
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host := "relay.example.com"
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c, err := mail.NewClient(host,
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mail.WithSMTPAuth(mail.SMTPAuthPlain), mail.WithUsername("ttester"),
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mail.WithPassword("V3rySecUr3!Pw."), mail.WithTLSPolicy(mail.TLSMandatory))
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if err != nil {
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fmt.Printf("failed to create new mail client: %s\n", err)
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os.Exit(1)
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}
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// Now that we have our client, we can connect to the server and send our mail message
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// via the convenient DialAndSend() method. You have the option to Dial() and Send()
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// seperately as well
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if err := c.DialAndSend(m); err != nil {
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fmt.Printf("failed to send mail: %s\n", err)
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os.Exit(1)
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}
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fmt.Println("Mail successfully sent.")
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}
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```
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## Contributors
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Thanks to the following people for contributing to the go-mail project:
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* [Dhia Gharsallaoui](https://github.com/dhia-gharsallaoui)
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* [inliquid](https://github.com/inliquid)
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* [Maria Letta](https://github.com/MariaLetta) (designed the go-mail logo)
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