Go 发送邮件

官方提供了 smtp 包用来发送邮件

package main

import (
    "log"
    "net/smtp"
)

func main() {
    // Set up authentication information.
    auth := smtp.PlainAuth("", "user@example.com", "password", "mail.example.com")

    // Connect to the server, authenticate, set the sender and recipient,
    // and send the email all in one step.
    to := []string{"recipient@example.net"}
    msg := []byte("To: recipient@example.net\r\n" +
        "Subject: discount Gophers!\r\n" +
        "\r\n" +
        "This is the email body.\r\n")
    err := smtp.SendMail("mail.example.com:25", auth, "sender@example.org", to, msg)
    if err != nil {
        log.Fatal(err)
    }
}

简单使用

简单使用例，封装一个发送邮件的功能

func SendToMail(user, sendUserName, password, host, to, subject, body, mailtype string) error {
    hp := strings.Split(host, ":")
    auth := smtp.PlainAuth("", user, password, 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: " + sendUserName + "<" + 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
}

使用例：

func main() {
    useremail := "用户邮箱"
    password := "用户密码"
    host := "smtpdm.aliyun.com:80"
    to := "目标邮箱"

    subject := "使用Golang发送邮件"

    body := `
        <!DOCTYPE html>
        <html lang="en">
        <head>
            <meta charset="iso-8859-15">
            <title>标题</title>
        </head>
        <body>
            GO 发送邮件，官方连包都帮我们写好了，真是贴心啊！！！
        </body>
        </html>`

    sendUserName := "GOLANG SEND MAIL" //发送邮件的人名称
    fmt.Println("send email")
    err := SendToMail(useremail, sendUserName, password, host, to, subject, body, "html")

    if err != nil {
        fmt.Println("Send mail error!")
        fmt.Println(err)
    } else {
        fmt.Println("Send mail success!")
    }
}

TLS 问题

func SendMailUsingTLS(addr string, auth smtp.Auth, from string,
    to []string, msg []byte) (err error) {
    log.Debugf("start SendMailUsingTLS... \n")
    //create smtp client
    c, err := Dial(addr)
    if err != nil {
        log.Errorf("Create smtp client error: %s \n", err)
        return err
    }

    defer c.Close()
    if auth != nil {
        if ok, _ := c.Extension("AUTH"); ok {
            if err = c.Auth(auth); err != nil {
                log.Errorf("Error during AUTH: \n", err)
                return err
            }
        }
    }
    if err = c.Mail(from); err != nil {
        log.Errorf("Mail error: %s \n", err)
        return err
    }

    for _, addr := range to {
        if err = c.Rcpt(addr); err != nil {
            log.Errorf("Mail error: %s \n", err)
            return err
        }
    }

    w, err := c.Data()
    if err != nil {
        log.Errorf("Mail error: %s \n", err)
        return err
    }

    _, err = w.Write(msg)
    if err != nil {
        log.Errorf("Mail error: %s \n", err)
        return err
    }

    err = w.Close()
    if err != nil {
        log.Errorf("Mail error: %s \n", err)
        return err
    }
    return c.Quit()
}

func Dial(addr string) (*smtp.Client, error) {
    conn, err := tls.Dial("tcp", addr, nil)
    // conn, err := tls.Dial("tcp", addr, &tls.Config{InsecureSkipVerify:true})
    if err != nil {
        log.Errorf("Dialing Error: %s \n", err)
        return nil, err
    }

    //分解主机端口字符串
    host, _, _ := net.SplitHostPort(addr)
    return smtp.NewClient(conn, host)
}

简单使用​

TLS 问题​

简单使用

TLS 问题