func (n *SESNotificator) SendMail(ctx *auth.AuthContext, subject, message, from, to string) error {
// Setup headers
headers := make(map[string]string)
headers["From"] = from
headers["To"] = to
headers["Subject"] = subject
// Setup message body
body := ""
for k, v := range headers {
body += fmt.Sprintf("%s: %s\r\n", k, v)
}
body += "\r\n" + message
// Connect to the SMTP Server
servername := n.Server + ":" + strconv.Itoa(n.Port)
auth := smtp.PlainAuth("", n.User, n.Password, n.Server)
// TLS config
tlsconfig := &tls.Config{
InsecureSkipVerify: true,
ServerName: n.Server,
}
// Here is the key, you need to call tls.Dial instead of smtp.Dial
// for smtp servers running on 465 that require an ssl connection
// from the very beginning (no starttls)
conn, err := tls.Dial("tcp", servername, tlsconfig)
if err != nil {
return err
}
send := func() error {
c, err := smtp.NewClient(conn, n.Server)
if err != nil {
return err
}
if err = c.Auth(auth); err != nil {
return err
}
if err = c.Mail(from); err != nil {
return err
}
if err = c.Rcpt(to); err != nil {
return err
}
w, err := c.Data()
if err != nil {
return err
}
_, err = w.Write([]byte(body))
if err != nil {
return err
}
err = w.Close()
if err != nil {
return err
}
return c.Quit()
}
c := make(chan error, 1)
go func() {
c <- send()
}()
select {
case <-ctx.Context.Done():
conn.Close()
<-c // Wait for send to return.
return ctx.Err()
case err := <-c:
return err
}
}
