golang 通过 qq 开通smtp 发送邮件的全步骤（tls +ssl）

首先打开邮件

2 找到》设置》账户选项卡

这里会根据你的账号安全添加密保，添加密保后会给你一个密钥

（2）验证密保

（3）获取授权码

这个授权码一会会用到

提前须知：ssl, tls, 是不同的协议

首先我们用starttls 协议写一个简单的例子 1

============= = 1 start =====================

package main

import (
   "net/smtp"
   "strings"
   "fmt"
)

func SendToMail(user, pwd, host, to, subject, body, mailtype string) error{
   hp := strings.Split(host, ":")

   auth := smtp.PlainAuth("", user, pwd, hp[0])

   var content_type string

   if mailtype == "html" {

      content_type = "Content-Type: text/" + mailtype + "; charset=UTF-8"

   } else {
      content_type = "Content-Type: text/plain" + "; charset=UTF-8"


   }


   msg := []byte("To: " + to + "\r\nFrom: " + user + "\r\nSubject: " +subject+ "\r\n" + content_type + "\r\n\r\n" + body)
   send_to := strings.Split(to, ";")
   err := smtp.SendMail(host, auth, user, send_to, msg)
   return err


}


func main(){

   user  := "2677031999@qq.com"   //  你开通smtp邮箱的 邮箱的地址
   pwd := "gv**************jfh"  //这里填你自己的授权码
   host :="smtp.qq.com:25"
   to := "2677031999@qq.com"   //  目标地址
   subject := "使用Golang发送邮件"
   body := `
      <html>
      <body>
      <h3>
      "Test send to email"
      </h3>
      </body>
      </html>
      `
      fmt.Println("SEND EMAIL ...")

      err :=SendToMail(user,pwd,host,to,subject,body,"html")


      if err != nil{
         fmt.Println("发送邮件错误！")
         fmt.Println(err);
      }else{
         fmt.Println("发送成功")
      }
}

======================= 1 end ====================

好了由于很多时侯需要用到 ssl 协议

==== 2 start ==========

package main

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

func main(){
   host :="smtp.qq.com"
   port :=465
   email  := "2677031999@qq.com"
   pwd := "gvd************fh"  // 这里填你的授权码
   toEmail := "2677031999@qq.com"  // 目标地址 

   header   :=  make(map[string]string)

   header["From"] = "test"+"<" +email+">"
   header["To"] = toEmail
   header["Subject"] = "邮件标题11111"
   header["Content-Type"] = "text/html;chartset=UTF-8"

   body  := "这是一封golang 发来的邮件"

   message := ""

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

   message +="\r\n"+body


   auth :=smtp.PlainAuth(
      "",
      email,
      pwd,
      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.Panicln("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()
}

======================= 2 end ==============================

结果

其实你观察两种方法很类似 golang官方库net/smtp支持的是starttls, , 要想支持 ssl将上面例子只是将net 的 Dial 换成 tls.

golang 通过 qq 开通smtp 发送邮件的 全步骤（tls +ssl）

golang 通过 qq 开通smtp 发送邮件的全步骤（tls +ssl）