net-smtp

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邮件的一般格式

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From:chimps@example.com
To:to@163.com
Subject:TEST EMAIL
Content-Type: text/html; chatset=UTF-8

<h1>hello go</h1>

使用阿里云企业邮注意事项

如果你的域名为example.com
在阿里的域名那里都配好之后，发邮件的配置应该如下：

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HOST: smtp.example.com
HOST_ADDR: smtp.example.com:25
USER: 该企业邮箱所创建的子邮箱
PASSWORD：user的password

代码：

主要是使用net/smtp包的SendMail方法

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package main

import (
	"fmt"
	"net/smtp"
	"strings"
)

const (
	HOST     = "smtp.example.com"
	ADDR     = "smtp.example.com:25"
	USER     = "chimps@example.com"
	PASSWORD = "xxx"
)

func main() {
	to := "to1@163.com;to1@163.com"
	subject := "TEST EMAIL"
	email_type := "html"
	message := "<h1>hello go</h1>"
	if err := SendEmail(to, subject, email_type, message); err != nil {
		fmt.Println("发送失败, reason:" + err.Error())
	}
}

func SendEmail(to string, subject string, email_type string, message string) (err error) {
	var content_type string
	switch email_type {
	case "html":
		content_type = "Content-Type: text/html; chatset=UTF-8"
	case "text":
		content_type = "Content-Type: text/plain; chatset=UTF-8"
	}
	auth := smtp.PlainAuth("", USER, PASSWORD, HOST)
	send_to := strings.Split(to, ";")
	for _, v := range send_to {
		var msg []string
		msg = append(msg, "From:"+USER, "To:"+v, "Subject:"+subject, content_type, "\r\n"+message)
		msg_string := strings.Join(msg, "\r\n")
		fmt.Println(msg_string)

		if err = smtp.SendMail(ADDR, auth, USER, []string{v}, []byte(msg_string)); err != nil {
			fmt.Println("send fail , reason: " + err.Error())
			return
		} else {
			fmt.Println("send ok :" + v)
		}
	}
	return
}

改进

一般情况下，发邮件时间比较耗时的事情，一般走异步处理