SMTP SERVER OR RELAY

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SMTP

using c#, i have created a class to save emails messages to a pickup directory to local host.
now, i wanted to ask is it possible to use IIS (internet information services )for sending the saved messages? i ma using windows 8.

if u know any SMTP relay for sending emails, please share it. thank you!


the following code is sending the emails correctly when the attachment size is lower than 10 MB, so i wanted to change and save the messages to pickup folder then using IIS for sending emails or any using any SMTP SERVER or relay ..
thank you for help!

// send the email in a new thread..
 private void SynchonEmilSender_DoWork(object sender, DoWorkEventArgs e)
 {
     bool isSent = true;
     try
     {

         _uiMailMainWindow.Dispatcher.BeginInvoke(DispatcherPriority.Normal, (ThreadStart)delegate()
         {
             sendEmailNotation.Mid = composeMessageTextBox.Mid;
             sendEmailNotation.lbl_notation_text.Foreground = Brushes.Black;
             // add once Only.
             if (!isFound())
             {
                 _uiMailMainWindow.stack_send_email_noations.Children.Add(sendEmailNotation);
             }
             composeMessageTextBox.Visibility = Visibility.Collapsed;
             if (composeMessageTextBox.MyTap != null)
             { composeMessageTextBox.MyTap.IsEnabled = false; }


             if (composeMessageTextBox.IsForwardMessage)
             {
                 string str = composeMessageTextBox.mailMessage.Subject;
                 composeMessageTextBox.mailMessage.Subject = "FW:" + str;
                 composeMessageTextBox.btn_send.IsEnabled = false;

             }
             if (composeMessageTextBox.IsReplyMessage)
             {
                 string str = composeMessageTextBox.mailMessage.Subject;
                 composeMessageTextBox.mailMessage.Subject = "RE:" + str;
                 composeMessageTextBox.btn_send.IsEnabled = false;
             }


         });

         SmtpClient SmtpclientSide = new SmtpClient("smtp.live.com", 587);
         SmtpclientSide.UseDefaultCredentials = true;
         SmtpclientSide.DeliveryMethod = SmtpDeliveryMethod.Network;
         //SmtpclientSide.PickupDirectoryLocation = Directory.GetCurrentDirectory();
         SmtpclientSide.Credentials = new System.Net.NetworkCredential(Ulogin.EmailAddress,Ulogin.EmailPassword);
         SmtpclientSide.EnableSsl =true;

         // add FW: and RE:
        composeMessageTextBox.mailMessage.Priority = MailPriority.High;
        SmtpclientSide.Send(composeMessageTextBox.mailMessage);

     }
     catch(SmtpException exp)
     {
         isSent = false;
         MessageBox.Show(exp.StatusCode.ToString());
     }
     finally
     {
         if (isSent) { SynchonEmilSender.ReportProgress(100); }
         else { SynchonEmilSender.ReportProgress(0); }
     }
 }