golang net/smtp SMTP AUTH LOGIN Auth Handler

smtp_login_auth.go

// MIT license (c) andelf 2013


import (
	"net/smtp"
	"errors"
)

type loginAuth struct {
  username, password string
}

func LoginAuth(username, password string) smtp.Auth {
	return &loginAuth{username, password}
}

func (a *loginAuth) Start(server *smtp.ServerInfo) (string, []byte, error) {
	return "LOGIN", []byte{}, nil
}

func (a *loginAuth) Next(fromServer []byte, more bool) ([]byte, error) {
	if more {
		switch string(fromServer) {
		case "Username:":
			return []byte(a.username), nil
		case "Password:":
			return []byte(a.password), nil
		default:
			return nil, errors.New("Unkown fromServer")
		}
	}
	return nil, nil
}


// usage: 
// auth := LoginAuth("loginname", "password")
// err := smtp.SendMail(smtpServer + ":25", auth, fromAddress, toAddresses, []byte(message))
// or	
// client, err := smtp.Dial(smtpServer)
// client.Auth(LoginAuth("loginname", "password"))

Very useful, thanks! I've updated the code to submit the username when Start is called, which means one less network exchange.

Extremely grateful to see that this was the answer to all my problems.

Thank you very very much...!

Such a simple fix. Can't believe the standard library doesn't support LOGIN.

This worked for me using:
Server: smtp-mail.outlook.com
Port: 587
SMTP security: STARTTLS

Thank you for posting.

thx dude!