Golang如何用 net/smtp 发送邮件_Golang SMTP 客户端邮件发送实战

To: recipient@example.com
Subject: 测试邮件

这是邮件正文。

package main

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

func sendEmail() error {
    from := "your_email@qq.com"
    password := "your_authorization_code" // 不是登录密码
    to := "recipient@example.com"
    smtpHost := "smtp.qq.com"
    smtpPort := "587"

    // 构造邮件内容
    subject := "测试主题"
    body := "这是一封来自 Go 程序的测试邮件。"
    msg := fmt.Sprintf("To: %s\r\nSubject: %s\r\n\r\n%s", to, subject, body)

    // 解析发件人邮箱
    sender, err := mail.ParseAddress(from)
    if err != nil {
        return err
    }

    auth := smtp.PlainAuth("", from, password, smtpHost)

    // 建立连接
    conn, err := smtp.Dial(smtpHost + ":" + smtpPort)
    if err != nil {
        return err
    }
    defer conn.Close()

    // 启用 TLS
    if err = conn.StartTLS(&tls.Config{ServerName: smtpHost}); err != nil {
        return err
    }

    // 认证
    if err = conn.Auth(auth); err != nil {
        return err
    }

    // 设置发件人和收件人
    if err = conn.Mail(sender.Address); err != nil {
        return err
    }
    if err = conn.Rcpt(to); err != nil {
        return err
    }

    // 写入邮件数据
    writer, err := conn.Data()
    if err != nil {
        return err
    }
    _, err = writer.Write([]byte(msg))
    if err != nil {
        return err
    }
    err = writer.Close()
    if err != nil {
        return err
    }

    return conn.Quit()
}

func main() {
    if err := sendEmail(); err != nil {
        fmt.Printf("发送失败: %v\n", err)
    } else {
        fmt.Println("邮件发送成功！")
    }
}