Send Mail by Go

package main

import (
 "log"
 "net/smtp"
)

func main() {
 // Set up authentication information.
 auth := smtp.PlainAuth(
  "",
  "user@goyun.info",
  "password",
  "mail.goyun.info",
 )
 // Connect to the server, authenticate, set the sender and recipient,
 // and send the email all in one step.
 err := smtp.SendMail(
  "mail.goyun.info:25",
  auth,
  "sender@goyun.info",
  []string{"recipient@goyun.info"},
  []byte("This is the email body."),
 )
 if err != nil {
  log.Fatal(err)
 }
}