Go 提供一个smtp（简单邮件传输协议）库作为其网络包的一部分，“net/smpt"公开了一些可以立即使用的功能
Gomail - 一个比较成熟的第三包，提供一个快捷、简单的解决方案，可以轻松地发送电子邮件。Gomail包下载地址。下载完放在src/gopkg.in目录下
func sendEMail() error {
senderAddr := "1843121593@qq.com"
receviceAddr := "1843121593@qq.com"
authcode = "" //这个需要自己的授权码
auth := smtp.PlainAuth("", senderAddr, authCode, "smtp.qq.com")
to := []string{receviceAddr}
nickname := "test" //会自动修改为发件人的名字
subject := "卡巴内" //设置主题
contentType := "Content-Type:text/plain;charset=UTF-8\r\n"
body := "this is email body"
// 支持群发
msg := []byte("To: " + strings.Join(to, ",") + "\r\nFrom: " + nickname +
"<" + senderAddr + ">\r\nSubject: " + subject + "\r\n" + contentType + "\r\n\r\n" + body)
err := smtp.SendMail("smtp.qq.com:25", auth, senderAddr, to, msg)
if err != nil {
err = fmt.Errorf("发送失败%v", err)
log.Println(err)
return err
}
return nil
}package main
import (
"bytes"
"fmt"
"log"
"strings"
"encoding/base64"
"io/ioutil"
"net/smtp"
)
senderAddr := "1843121593@qq.com"
receviceAddr := "1843121593@qq.com"
authcode = "" //这个需要自己的授权码
type Mail interface{
Auth()
Send(message Message) error
}
// 验证
type SendMail struct{
user string
password string // 授权码
host string // 服务器名称
port string // 端口
auth smtp.Auth //验证函数
}
// 附件
type Attachment struct{
name string // 附件名字
contentType string // 附件的类型
withFile bool // ？
}
// 邮件内容
type Message struct{
from string // 源地址
to []string //目的地址
cc []string
bcc []string
subject string // 主题
body string // 文件内容
contentType string // 内容的类型
attachment Attachment
}
// 申请客户端能够发送权限
func (mail *SendMail)Auth(){
mail.auth = smtp.PlainAuth("",mail.user,mail.password,mail.host)
}
// 将消息头写入缓冲区
func (mail SendMail) writeHeader(buffer *bytes.Buffer,Header map[string]string)string{
header := ""
for key,value := range Header{
header +=key + ":" +value + "\r\n"
}
header += "\r\n"
buffer.WriteString(header)
return header
}
// 读取文件
func (mail SendMail)writeFile(buffer *bytes.Buffer,fileName string)error{
file,err:= ioutil.ReadFile(fileName)
if err!=nil{
log.Println(err)
return err
}
log.Println("len(file)",len(file))
log.Println("进行base64编码")
payload := make([]byte,base64.StdEncoding.EncodedLen(len(file))) //返回n字节数据进行base64编码后的最大长度
// log.Println("pyload:",payload)
base64.StdEncoding.Encode(payload,file) //base64编码
log.Println("写入缓存")
buffer.WriteString("\r\n")
for index,line :=0,len(payload);index<line;index++{
// 写入缓存
buffer.WriteByte(payload[index])
if (index+1)%76==0{
buffer.WriteString("\r\n")
}
}
return nil
}
// 发送消息
func (mail SendMail)Send(message Message)(err error){
mail.Auth()
// 创建一个缓冲区
buffer := bytes.NewBuffer(nil)
boundary :="GoBoundary"
// 设置邮件的头部信息
Header := make(map[string]string)
Header["From"] = message.from
Header["To"] = strings.Join(message.to,";") //将字符串数组转化为字符串
Header["Cc"] = strings.Join(message.cc,";")
Header["Bcc"] = strings.Join(message.bcc,";")
Header["Subject"] = message.subject
Header["Content-Type"] = "multipart/mixed;boundary="+boundary
Header["Mime-Version"] = "1.0"
Header["Date"] = time.Now().String() //以上的这些信息都是要填的
mail.writeHeader(buffer,Header)
// 设置body值
body := "\r\n--" + boundary + "\r\n"
body += "Content-Type:"+message.contentType+"\r\n"
body += "\r\n" + message.body + "\r\n"
buffer.WriteString(body)
if message.attachment.withFile{
attachment := "\r\n--"+boundary + "\r\n"
attachment += "Content-Transfer-Encoding:base64\r\n" //指明编码转换格式：base64
attachment += "Content-Disposition:attachment\r\n" //规定以什么方式下载
attachment += "Content-Type:"+message.attachment.contentType+";name=\""+message.attachment.name+"\r\n"
buffer.WriteString(attachment) // 当内容超过缓存区的容量的时候，会发生panic
defer func(){
if e:= recover();e!=nil{
err = e.(error) //强制转化一下类型
log.Println(e)
}
}()
}
log.Println("读取文件")
if err = mail.writeFile(buffer,message.attachment.name);err!=nil{
log.Println(err)
return
}
buffer.WriteString("\r\n")
log.Println("buffer",buffer.String())
err = smtp.SendMail(mail.host+":"+mail.port,mail.auth,message.from,message.to,buffer.Bytes())
if err!=nil{
log.Println(err)
return
}
log.Println("发送成功")
return
}
func main() {
fmt.Println("go邮箱发送")
var mail Mail
mail = &SendMail{user:senderAddr,password:authCode,host:"smtp.qq.com",port:"25"}
message := Message{from: senderAddr,
to: []string{receviceAddr},
cc: []string{},
bcc: []string{},
subject: "HELLO WORLD",
body: "",
contentType: "text/plain;charset=utf-8",
attachment: Attachment{
name: "000008-1572019208ea18.jpg",
contentType: "image/jpg",
withFile: true,
},
}
mail.Send(message)
}gomail使用
func sendEMailNotIncludeFile()error{
senderAddr := "1843121593@qq.com"
receviceAddr := "1843121593@qq.com"
authcode = "" //这个需要自己的授权码
// 创建消息体，不要认为Header完全看作是请求头，Header包含了邮件的头部信息
m := gomail.NewMessage()
m.SetAddressHeader("From:",senderAddr,"没有彩虹的阳光")
dst := m.FormatAddress(receviceAddr,"无季")
m.SetHeader("To",dst)
m.SetHeader("Subject","卡巴内瑞")
m.SetBody("text/html","<a href=\"https://www.cnblogs.com/MyUniverse\">MyUnicerse</a>") //设置邮件发送的内容
d := gomail.NewPlainDialer("smtp.qq.com",25,senderAddr,authCode) // 创建连接
if err := d.DialAndSend(m);err!=nil{
log.Println(err)
return err
}
return nil
}// 使用框架发送
func SendMailIncludeFile(){
senderAddr := "1843121593@qq.com"
receviceAddr := "1843121593@qq.com"
authcode = "" //这个需要自己的授权码
attchAddr = "" //上传文件的地址
m:=gomail.NewMessage()
m.SetAddressHeader("From",senderAddr,"无季")
m.SetHeader("To",m.FormatAddress(receviceAddr,"无季"))
m.SetHeader("Subject","GOMaIL")
m.SetBody("text/html","Hello <a href = \"https://www.cnblogs.com/MyUniverse\">MyUnicerse</a>")
m.Attach(attachAddr)
d := gomail.NewPlainDialer("smtp.qq.com",465,senderAddr,attchAddr)
if err := d.DialAndSend(m);err!=nil{
panic(err)
}
}authCode的获取方法
[go语言实现SMTP邮件发送功能](
原文：https://www.cnblogs.com/MyUniverse/p/11894683.html