從hotmail發送郵件失敗有時使用c＃

Question

我有c＃代碼發送郵件。該代碼工作正常的Gmail，雅虎配置。但是對於hotmail，有時會發送郵件，有時郵件不會發送。我觀察到，與Gmail相比，雅虎郵件的響應時間更好。但與Yahoo，Gmail相比，hotmail的響應非常差。

會是什麼原因？如何配置hotmail以獲得良好的響應。

這是我的代碼來發送郵件：

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

如果你想在上面的代碼發送電子郵件，它顯然不能夠把它，我不知道你用的是什麼原因Ping類發送電子郵件。

固定碼：

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); 
    }