An ESMTP client and server library written in Go.
- ESMTP client & server implementing RFC 5321
- Support for SMTP AUTH and PIPELINING
- UTF-8 support for subject and message
- LMTP support
package main
import (
"log"
"strings"
"github.com/emersion/go-sasl"
"github.com/emersion/go-smtp"
)
func main() {
// Setup authentication information.
auth := sasl.NewPlainClient("", "[email protected]", "password")
// Connect to the server, authenticate, set the sender and recipient,
// and send the email all in one step.
to := []string{"[email protected]"}
msg := strings.NewReader("To: [email protected]\r\n" +
"Subject: discount Gophers!\r\n" +
"\r\n" +
"This is the email body.\r\n")
err := smtp.SendMail("mail.example.com:25", auth, "[email protected]", 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"
"github.com/emersion/go-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{"[email protected]"}
msg := strings.NewReader("To: [email protected]\r\n" +
"Subject: discount Gophers!\r\n" +
"\r\n" +
"This is the email body.\r\n")
err := c.SendMail("[email protected]", to, msg)
if err != nil {
log.Fatal(err)
}
}package main
import (
"errors"
"io"
"io/ioutil"
"log"
"time"
"github.com/emersion/go-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 {
auth bool
}
func (s *Session) AuthPlain(username, password string) error {
if username != "username" || password != "password" {
return smtp.ErrAuthFailed
}
s.auth = true
return nil
}
func (s *Session) Mail(from string, opts *smtp.MailOptions) error {
if !s.auth {
return smtp.ErrAuthRequired
}
log.Println("Mail from:", from)
return nil
}
func (s *Session) Rcpt(to string) error {
if !s.auth {
return smtp.ErrAuthRequired
}
log.Println("Rcpt to:", to)
return nil
}
func (s *Session) Data(r io.Reader) error {
if !s.auth {
return smtp.ErrAuthRequired
}
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:<[email protected]>
RCPT TO:<[email protected]>
DATA
Hey <3
.
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.
MIT