Thank you very much for your reply. However, in my code, it spent 40s to 
send email. 

Here is the code:

now := time.Now()
msg := gomail.NewMessage()
//the element of msg is abridged
dial := gomail.Dialer{Host: "127.0.0.1", Port: 25}
dial.TLSConfig = &tls.Config{InsecureSkipVerify: true}
if err := dial.DialAndSend(msg); err != nil {
    log.Fatal("failed to send email", err)
} else {
    timeSpent := fmt.Sprintf("%.3f s", time.Since(now).Seconds())
    fmt.Println("time to spend in sending email", timeSpent )
}

在 2017年8月25日星期五 UTC+8上午1:53:48,Tamás Gulácsi写道:
>
> It uses a constant 10s timeout for dial. What should time out?

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