title: Error when trying to send mails using smtp
body: <p>I have got the following error message when i tried to sent message using smtp.</p>
  
  <pre>
  A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 67.69.240.69:25
  System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 67.69.240.69:25
     at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
     at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Int32 timeout, Exception& exception)
     --- End of inner exception stack trace ---
     at System.Net.ServicePoint.GetConnection(PooledStream PooledStream, Object owner, Boolean async, IPAddress& address, Socket& abortSocket, Socket& abortSocket6, Int32 timeout)
     at System.Net.PooledStream.Activate(Object owningObject, Boolean async, Int32 timeout, GeneralAsyncDelegate asyncCallback)
     at System.Net.PooledStream.Activate(Object owningObject, GeneralAsyncDelegate asyncCallback)
     at System.Net.ConnectionPool.GetConnection(Object owningObject, GeneralAsyncDelegate asyncCallback, Int32 creationTimeout)
     at System.Net.Mail.SmtpConnection.GetConnection(String host, Int32 port)
     at System.Net.Mail.SmtpClient.Send(MailMessage message)
     --- End of inner exception stack trace ---
     at System.Net.Mail.SmtpClient.Send(MailMessage message)
     at Handler.BLL.cSendMail.SendMail(String p_strFrom, String p_strDisplayName, String p_strTo, String p_strSubject, String p_strMessage, String strFileName)
  [ staffID:,21/08/2013 9:49:34 AM ]: status code : GeneralFailure</pre>
  
  <p>code</p>
  
  <pre><code>   public bool SendMail(string p_strFrom, string p_strDisplayName, string p_strTo, string p_strSubject, string p_strMessage , string strFileName)
   {
       try
       {
           p_strDisplayName = _DisplayName;
           string smtpserver = _SmtpServer;
           SmtpClient smtpClient = new SmtpClient();
           MailMessage message = new MailMessage();
           MailAddress fromAddress = new MailAddress(_From,_DisplayName);
           smtpClient.Host = _SmtpServer;
           smtpClient.Port = Convert.ToInt32(_Port);
           string strAuth_UserName = _UserName;
           string strAuth_Password = _Password;
           if (strAuth_UserName != null)
           {
               System.Net.NetworkCredential SMTPUserInfo = new System.Net.NetworkCredential(strAuth_UserName, strAuth_Password);
               smtpClient.UseDefaultCredentials = false;
               if (_SSL)
               {
                   smtpClient.EnableSsl = true;
               }
               smtpClient.Credentials = SMTPUserInfo;
           }
           message.From = fromAddress;
  
           message.Subject = p_strSubject;
           message.IsBodyHtml = true;
           message.Body = p_strMessage;
           message.To.Add(p_strTo);
           try
           {
               smtpClient.Send(message);
               Log.WriteSpecialLog("smtpClient mail sending first try success", "");
           }
            catch (Exception ee)
           {
               Log.WriteSpecialLog("smtpClient mail sending first try Failed : " + ee.ToString(), "");
               return false;
           }
           return true;
       }
       catch (Exception ex)
       {
           Log.WriteLog("smtpClient mail sending overall failed : " + ex.ToString());  
           return false;
       }
   }
  </code></pre>
  
  <p>when 3 or more mail sending only one or two fails</p>