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Postfix and Golang - Sending emails
package main
import (
"fmt"
"net/mail"
"net/smtp"
"strings"
)
var host = "127.0.0.1"
var port = "25"
var username = ""
var password = ""
var auth = smtp.PlainAuth("", username, password, host)
var addr = host + ":" + port
func main() {
fromName := "Fred"
fromEmail := "fred@example.com"
toNames := []string{"Ted"}
toEmails := []string{"ted@example.com"}
subject := "This is the subject of your email"
body := "This is the body of your email"
// Build RFC-2822 email
toAddresses := []string{}
for i, _ := range toEmails {
to := mail.Address{toNames[i], toEmails[i]}
toAddresses = append(toAddresses, to.String())
}
toHeader := strings.Join(toAddresses, ", ")
from := mail.Address{fromName, fromEmail}
fromHeader := from.String()
subjectHeader := subject
header := make(map[string]string)
header["To"] = toHeader
header["From"] = fromHeader
header["Subject"] = subjectHeader
header["Content-Type"] = `text/html; charset="UTF-8"`
msg := ""
for k, v := range header {
msg += fmt.Sprintf("%s: %s\r\n", k, v)
}
msg += "\r\n" + body
bMsg := []byte(msg)
// Send using local postfix service
c, err := smtp.Dial(addr)
if err != nil {
return
}
defer c.Close()
if err = c.Mail(fromHeader); err != nil {
return
}
for _, addr := range toEmails {
if err = c.Rcpt(addr); err != nil {
return
}
}
w, err := c.Data()
if err != nil {
return
}
_, err = w.Write(bMsg)
if err != nil {
return
}
err = w.Close()
if err != nil {
return
}
err = c.Quit()
// Or alternatively, send with remote service like Amazon SES
// err = smtp.SendMail(addr, auth, fromEmail, toEmails, bMsg)
// Handle response from local postfix or remote service
if err != nil {
return
}
}
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