使用 smtp.SendMail() 傳送電子郵件

在 Go 中傳送電子郵件非常簡單。它有助於理解 RFC 822，它指定了電子郵件需要的樣式，下面的程式碼傳送符合 RFC 822 的電子郵件。

package main

import (
    "fmt"
    "net/smtp"
)

func main() {
    // user we are authorizing as
    from := "someuser@example.com"

    // use we are sending email to
    to := "otheruser@example.com"

    // server we are authorized to send email through
    host := "mail.example.com"

    // Create the authentication for the SendMail()
    // using PlainText, but other authentication methods are encouraged
    auth := smtp.PlainAuth("", from, "password", host)

    // NOTE: Using the backtick here ` works like a heredoc, which is why all the 
    // rest of the lines are forced to the beginning of the line, otherwise the 
    // formatting is wrong for the RFC 822 style
    message := `To: "Some User" <someuser@example.com>
From: "Other User" <otheruser@example.com>
Subject: Testing Email From Go!!

This is the message we are sending. That's it!
`

    if err := smtp.SendMail(host+":25", auth, from, []string{to}, []byte(message)); err != nil {
        fmt.Println("Error SendMail: ", err)
        os.Exit(1)
    }
    fmt.Println("Email Sent!")
}

以上將傳送如下訊息：

To: "Other User" <otheruser@example.com>
From: "Some User" <someuser@example.com>
Subject: Testing Email From Go!!

This is the message we are sending. That's it!
.