GoDaddy的SMTP发送邮件的问题及解决方法

private bool sendMail()
    {
        try
        {
            MailAddress from = new MailAddress("Ur email address applied from GoDaddy.");
            MailAddress to = new MailAddress("The email address you will send to.");
            MailMessage message = new MailMessage(from, to);
            message.Subject = subject;
            message.Body = body;
            SmtpClient client = new SmtpClient("relay-hosting.secureserver.net", 25); //这里不是smtpout.secureserver.net
            client.DeliveryMethod = SmtpDeliveryMethod.Network;
            client.Credentials = CredentialCache.DefaultNetworkCredentials; //无需用户名密码
            client.Send(message);

            return true;
        }
        catch (System.Exception ex)
        {
            lbNotes.Text = ex.ToString();
            return false;
        }
    }