📧 Easy to use, yet comprehensive library for sending mails with Go https://go-mail.dev
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go-mail - Simple and easy way to send mails in Go

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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.

This library is "WIP" an should not be considered "production ready", yet.

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.

Features

Some of the features of this library:

  • Only Standard Library dependant
  • Modern, idiotmatic Go
  • Sane and secure defaults
  • SSL/TLS support
  • StartTLS support with different policies
  • Makes use of contexts for a better control flow and timeout/cancelation handling
  • SMTP Auth support (LOGIN, PLAIN, CRAM-MD5, DIGEST-MD5)
  • RFC5322 compliant mail address validation
  • Support for common mail header field generation (Message-ID, Date, Bulk-Precedence, etc.)
  • Reusing the same SMTP connection to send multiple mails
  • Support for different encodings
  • Support for attachments
  • Go template support

Example

package main

import (
	"context"
	"fmt"
	"github.com/wneessen/go-mail"
	"os"
	"time"
)

func main() {
	c, err := mail.NewClient("mail.example.com", mail.WithTimeout(time.Millisecond*500),
		mail.WithTLSPolicy(mail.TLSMandatory), mail.WithSMTPAuth(mail.SMTPAuthDigestMD5),
		mail.WithUsername("tester@example.com"), mail.WithPassword("secureP4ssW0rd!"))
	if err != nil {
		fmt.Printf("failed to create new client: %s\n", err)
		os.Exit(1)
	}
	defer c.Close()

	if err := c.DialAndSend(); err != nil {
		fmt.Printf("failed to dial: %s\n", err)
		os.Exit(1)
	}
}