package mainimport (    "fmt"    "net/smtp"    "strings")//发送邮件的逻辑函数func SendMail(user, 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: " + user + "<" + 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() {    // 邮箱账号    user := "xxxx@163.com"    //注意，此处为授权码、不是密码    password := "xxxx"    //smtp地址及端口    host := "smtp.163.com:25"    //接收者，内容可重复，多个邮箱之间用;隔开    to := "xxxxxx@qq.com"    //邮件主题    subject := "测试通过golang发送邮件"    //邮件内容    text := "XXX你好！"    body := `            
    "测试通过golang发送邮件"` + text + `    
            `    //    fmt.Println("send email")    //执行逻辑函数    err := SendMail(user, password, host, to, subject, body, "html")    if err != nil {        fmt.Println("发送邮件失败!")        fmt.Println(err)    } else {        fmt.Println("发送邮件成功!")    }}