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README
MIT

go-smtp

godocs.io builds.sr.ht status

An ESMTP client and server library written in Go.

Features

  • ESMTP client & server implementing RFC 5321
  • Support for SMTP AUTH and PIPELINING
  • UTF-8 support for subject and message
  • LMTP support

Usage

Client

package main

import (
	"log"
	"strings"

	"gitee.com/wpkg/smtp/sasl"
	"gitee.com/wpkg/smtp"
)

func main() {
	// Setup authentication information.
	auth := sasl.NewPlainClient("", "user@example.com", "password")

	// Connect to the server, authenticate, set the sender and recipient,
	// and send the email all in one step.
	to := []string{"recipient@example.net"}
	msg := strings.NewReader("To: recipient@example.net\r\n" +
		"Subject: discount Gophers!\r\n" +
		"\r\n" +
		"This is the email body.\r\n")
	err := smtp.SendMail("mail.example.com:25", auth, "sender@example.org", to, msg)
	if err != nil {
		log.Fatal(err)
	}
}

If you need more control, you can use Client instead. For example, if you want to send an email via a server without TLS or auth support, you can do something like this:

package main

import (
	"log"
	"strings"

	"gitee.com/wpkg/smtp"
)

func main() {
	// Setup an unencrypted connection to a local mail server.
	c, err := smtp.Dial("localhost:25")
	if err != nil {
		return err
	}
	defer c.Close()

	// Set the sender and recipient, and send the email all in one step.
	to := []string{"recipient@example.net"}
	msg := strings.NewReader("To: recipient@example.net\r\n" +
		"Subject: discount Gophers!\r\n" +
		"\r\n" +
		"This is the email body.\r\n")
	err := c.SendMail("sender@example.org", to, msg)
	if err != nil {
		log.Fatal(err)
	}
}

Server

package main

import (
	"errors"
	"io"
	"io/ioutil"
	"log"
	"time"

	"gitee.com/wpkg/smtp"
)

// The Backend implements SMTP server methods.
type Backend struct{}

func (bkd *Backend) NewSession(_ *smtp.Conn) (smtp.Session, error) {
	return &Session{}, nil
}

// A Session is returned after EHLO.
type Session struct{}

func (s *Session) AuthPlain(username, password string) error {
	if username != "username" || password != "password" {
		return errors.New("Invalid username or password")
	}
	return nil
}

func (s *Session) Mail(from string, opts *smtp.MailOptions) error {
	log.Println("Mail from:", from)
	return nil
}

func (s *Session) Rcpt(to string) error {
	log.Println("Rcpt to:", to)
	return nil
}

func (s *Session) Data(r io.Reader) error {
	if b, err := ioutil.ReadAll(r); err != nil {
		return err
	} else {
		log.Println("Data:", string(b))
	}
	return nil
}

func (s *Session) Reset() {}

func (s *Session) Logout() error {
	return nil
}

func main() {
	be := &Backend{}

	s := smtp.NewServer(be)

	s.Addr = ":1025"
	s.Domain = "localhost"
	s.ReadTimeout = 10 * time.Second
	s.WriteTimeout = 10 * time.Second
	s.MaxMessageBytes = 1024 * 1024
	s.MaxRecipients = 50
	s.AllowInsecureAuth = true

	log.Println("Starting server at", s.Addr)
	if err := s.ListenAndServe(); err != nil {
		log.Fatal(err)
	}
}

You can use the server manually with telnet:

$ telnet localhost 1025
EHLO localhost
AUTH PLAIN
AHVzZXJuYW1lAHBhc3N3b3Jk
MAIL FROM:<root@nsa.gov>
RCPT TO:<root@gchq.gov.uk>
DATA
Hey <3
.

Relationship with net/smtp

The Go standard library provides a SMTP client implementation in net/smtp. However net/smtp is frozen: it's not getting any new features. go-smtp provides a server implementation and a number of client improvements.

Licence

MIT

The MIT License (MIT) Copyright (c) 2010 The Go Authors Copyright (c) 2014 Gleez Technologies Copyright (c) 2016 emersion Copyright (c) 2016 Proton Technologies AG Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

简介

An SMTP client & server library written in Go. github.com/emersion/go-smtp 展开 收起
Go
MIT
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