go语言发送邮件

package main

import (
    "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 := "[email protected]"
    //注意，此处为授权码、不是密码
    password := "xxx"
    //smtp地址及端口
    host := "smtp.163.com:25"
    //接收者，内容可重复，邮箱之间用；隔开
    to := "[email protected]"
    //邮件主题
    subject := "测试通过golang发送邮件"
    //邮件内容
    text := "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!")
    }

}