从hotmail发送邮件有时会失败，使用C＃

Question

I have c# code to send mail. The code is working fine for gmail,yahoo configuration. But for hotmail sometimes the mail is sent and sometimes the mail is not sent. I observed that the response time for yahoo mail is better compare to gmail. But hotmail has very poor response compare to yahoo,gmail.

What will be reason? how to configure hotmail to get good response.

this is my code to send mail :

 private void button2_Click(object sender, EventArgs e)
 {

            SmtpClient client = new SmtpClient();
            MailMessage message = new MailMessage();

        message.To.Add("user_name");
                message.From = new MailAddress("user_name");
                message.Subject = "Email Confirmation";
                message.BodyEncoding = System.Text.Encoding.UTF8;
                message.SubjectEncoding = System.Text.Encoding.UTF8;

    client.Port=587
    client.Host="smtp.live.com";

    System.Net.NetworkCredential nc = new System.Net.NetworkCredential("user_name", "password");
                if (mail_server == "smtp.gmail.com" || mail_server == "smtp.live.com")
                {
                    client.EnableSsl = true;
                }
                client.UseDefaultCredentials = false;
                client.Credentials = nc;

                Ping p = new Ping();
                bool result = false;
                int i = 10;
                do
                {

                    PingReply reply = p.Send("smtp.live.com", 587);
                    if (reply.Status == IPStatus.Success)
                    {
                        result = true;
                    } Thread.Sleep(500);
                    i--;
                } while (result == false && i != 0);

                if (result == true)
                {
                    client.Send(message);
                    MessageBox.Show("Email sent successfully");                    


                }
                else
                {
                    MessageBox.Show("Email not sent");

                }
 }

Answer 1

If you are trying the above code to Send Email, it will obviously not be able to send it, I dont know for what reason you are using the Ping class to send email.

Fixed Code :

    SmtpClient client = new SmtpClient();
    MailMessage message = new MailMessage();

    message.To.Add("user_name");
    message.From = new MailAddress("user_name");
    message.Subject = "Email Confirmation";
    message.BodyEncoding = Encoding.UTF8;
    message.SubjectEncoding = Encoding.UTF8;

    client.Port = 587;
    client.Host = "smtp.live.com";

    NetworkCredential nc = new NetworkCredential("user_name", "password");
    string mail_server = "smtp.live.com";
    if (mail_server == "smtp.gmail.com" || mail_server == "smtp.live.com")
        {
            client.EnableSsl = true;
        }
        client.UseDefaultCredentials = false;
        client.Credentials = nc;

    try
    {
        client.Send(message);
    }
    catch (SmtpException exception)
    {
        Console.WriteLine(exception.Message);
    }