问c#通过gmail以外的主机发送电子邮件

EN

        MailMessage message = new MailMessage();
        message.To.Add("testEmail@hotmail.com");
        message.Subject = "C# generated message!";
        message.From = new MailAddress("mySendemailAddress@online.nl");
        message.Body = "This is the message body \r\nThis is a next line";
        message.DeliveryNotificationOptions=DeliveryNotificationOptions.OnFailure;
        SmtpClient smtp = new SmtpClient("smtp.online.nl", 485);
        smtp.EnableSsl = true;
        smtp.UseDefaultCredentials = false;
        smtp.Credentials=new NetworkCredential("mySendEmailAddress@online.nl", "password");

        smtp.Send(message);