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【GO】使用ssl连接发送邮件

作者:宝仔love / 发布于2014/4/3/ 966

目前支持ssl的smtp成为主流,gmail和qqmail不再支持非ssl的端口(但163的还可用),示例是为了发送程序通用以支持更多的email提供商而开发,已测试163,qq的邮箱很快而且都成功,gmail较慢有时成功有时会超时.

package main

import (
 "crypto/tls"
 "fmt"
 "log"
 "net"
 "net/smtp"
)

func main() {
 host := "smtp.qq.com"
 port := 465
 email := "xxx@qq.com"
 password := "xxx"
 toEmail := "xxx@qq.com"

 header := make(map[string]string)
 header["From"] = "test" + "<" + email + ">"
 header["To"] = toEmail
 header["Subject"] = "邮件标题"
 header["Content-Type"] = "text/html; charset=UTF-8"

 body := "我是一封电子邮件!golang发出."

 message := ""
 for k, v := range header {
  message += fmt.Sprintf("%s: %s\r\n", k, v)
 }
 message += "\r\n" + body

 auth := smtp.PlainAuth(
  "",
  email,
  password,
  host,
 )

 err := SendMailUsingTLS(
  fmt.Sprintf("%s:%d", host, port),
  auth,
  email,
  []string{toEmail},
  []byte(message),
 )

 if err != nil {
  panic(err)
 }
}

//return a smtp client
func Dial(addr string) (*smtp.Client, error) {
 conn, err := tls.Dial("tcp", addr, nil)
 if err != nil {
  log.Println("Dialing Error:", err)
  return nil, err
 }
 //分解主机端口字符串
 host, _, _ := net.SplitHostPort(addr)
 return smtp.NewClient(conn, host)
}

//参考net/smtp的func SendMail()
//使用net.Dial连接tls(ssl)端口时,smtp.NewClient()会卡住且不提示err
//len(to)>1时,to[1]开始提示是密送
func SendMailUsingTLS(addr string, auth smtp.Auth, from string,
 to []string, msg []byte) (err error) {

 //create smtp client
 c, err := Dial(addr)
 if err != nil {
  log.Println("Create smpt client error:", err)
  return err
 }
 defer c.Close()

 if auth != nil {
  if ok, _ := c.Extension("AUTH"); ok {
   if err = c.Auth(auth); err != nil {
    log.Println("Error during AUTH", err)
    return err
   }
  }
 }

 if err = c.Mail(from); err != nil {
  return err
 }

 for _, addr := range to {
  if err = c.Rcpt(addr); err != nil {
   return err
  }
 }

 w, err := c.Data()
 if err != nil {
  return err
 }

 _, err = w.Write(msg)
 if err != nil {
  return err
 }

 err = w.Close()
 if err != nil {
  return err
 }

 return c.Quit()
}

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　ssl连接　

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