Sending email is pretty simple in Go. It helps to understand the RFC 822, which specifies the style an email need to be in, the code below sends a RFC 822 compliant email.
package main
import (
"fmt"
"net/smtp"
)
func main() {
// user we are authorizing as
from := "[email protected]"
// use we are sending email to
to := "[email protected]"
// 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" <[email protected]>
From: "Other User" <[email protected]>
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!")
}
The above will send a message like the following:
To: "Other User" <[email protected]>
From: "Some User" <[email protected]>
Subject: Testing Email From Go!!
This is the message we are sending. That's it!
.