邮件推送 Go 调用示例-SMTP 文档-文档中心-腾讯云

以下代码示例，Go 语言（版本为1.16）通过 SMTP 发送邮件：
﻿
1. 目前服务端支持的 ssl 协议和加密套件如下，请选择适合的 ssl 版本：
ssl_protocols    TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
ssl_ciphers      ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA256:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:RC4-MD5:RC4-SHA;
2. 服务地址和端口请参见 SMTP 服务地址。
以下是代码示例：
package main
﻿
import (
    "crypto/tls"
    "fmt"
    "log"
    "net"
    "net/smtp"
)
﻿
// Test465  for port 465
func Test465() error {
    host := "smtp.qcloudmail.com"
    port := 465
    //控制台创建的发信地址
    email := "abc@cd.com" 
    //控制台设置的SMTP密码
    password := "****"
    toEmail := "test@test123.com"
    ccEmail := "cc@test123.com"
    bccEmail := "bcc@test123.com"
    header := make(map[string]string)
    header["From"] = "test " + "<" + email + ">"
    header["To"] = toEmail
    header["Cc"] = ccEmail
    header["Bcc"] = bccEmail
    header["Subject"] = "test subject"
    //html格式邮件
    header["Content-Type"] = "text/html; charset=UTF-8"
    body := "<!DOCTYPE html>\\n<html>\\n<head>\\n<meta charset=\\"utf-8\\">\\n<title>hello world</title>\\n</head>\\n<body>\\n " +
        "<h1>我的第一个标题</h1>\\n    <p>我的第一个段落。</p>\\n</body>\\n</html>"
    //纯文本格式邮件
    //header["Content-Type"] = "text/plain; charset=UTF-8"
    //body := "test body"
    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 := SendMailWithTLS(
        fmt.Sprintf("%s:%d", host, port),
        auth,
        email,
        []string{toEmail},
        []byte(message),
    )
    if err != nil {
        fmt.Println("Send email error:", err)
    } else {
        fmt.Println("Send mail success!")
    }
    return err
}
﻿
// Dial return a smtp client
func Dial(addr string) (*smtp.Client, error) {
    conn, err := tls.Dial("tcp", addr, nil)
    if err != nil {
        log.Println("tls.Dial Error:", err)
        return nil, err
    }
﻿
    host, _, _ := net.SplitHostPort(addr)
    return smtp.NewClient(conn, host)
}
﻿
// SendMailWithTLS send email with tls
func SendMailWithTLS(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 smtp 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()
}
﻿
func main() {
    Test465()
}
﻿