Implementing Email Alert in my application without giving SMTP IP address

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ASP.NET

Hi Friends,

I need to implement Email Alerts in my application without giving SMTP-IP Address.

With IP I have done that as following.

private void SendingMail(string toList, string subject, string sentby)
   {
       //Sending Mail....

       MailMessage message = new MailMessage();
       SmtpClient smtpClient = new SmtpClient();
       string msg = string.Empty;

       string body = "You have received a file from Honey";


       MailServerIp = "172.185.30.9"; // Changed IP not orginal
       MailFrom = "Honey@gmail.com";// Just sample mail not orginal
       MailFromPwd = "asdfasdf" ; // just sample pwd not original
      try
       {
           MailAddress fromAddress = new MailAddress(MailFrom);
           message.From = fromAddress;
           message.To.Add(toList);
           message.Subject = "Mail Alert Sent Successfylly";
           message.IsBodyHtml = true;
           if (body != "")
               message.Body = body;

           smtpClient.Host = MailServerIp;
           smtpClient.Credentials = new NetworkCredential(fromAddress.ToString(), MailFromPwd);
           smtpClient.Send(message);   //send.....

           message.To.Clear();

       }
       catch (Exception ex)
       {
           msg = ex.Message;
       }

   }

I want that without giving IP address.