//---------------------------------------------------------------------------
      // DATA command request handling.
      //---------------------------------------------------------------------------      

      else if(command(input) == "DATA") {

         //--------------------------------------------------------------
         // We must have recipients before we can send data.
         //--------------------------------------------------------------

         if(state == "RCPT") {

            //---------------------------------------------------------
            // Prompt for client to begin entering mail message data.
            //---------------------------------------------------------

            cout << "354 Enter the mail message terminated by <CRLF>.<CRLF>" << CRLF;

            mailData = "";

            //-----------------------------------------------------------
            // Receive mail message one line at a time and keep an eye
            // out for the terminating period character.
            //-----------------------------------------------------------

            do {

               alarm(120);

               if(!getline(cin, input)) {
                  return -1;
               }

               if(input[input.length() - 1] == '\r')
                 input.erase(input.length() - 1);

               alarm(0);
              if(input != ".") {

                  //--------------------------------------------------------------
                  // If there was a period for the first character but it wasn't
                  // the only character then remove and ignore the first period.
                  // This is the transparency mode capability.
                  //--------------------------------------------------------------

                  if(input[0] == '.') {
                     mailData += input.substr(1) + CRLF;
                  }
                  
                  else {
                     mailData += input + CRLF;
                  }
                  
               }  
               
            } while(input != ".");

            //------------------------------------------------------------------
            // Run the received message through an external filter program if
            // one is configured into the system settings.
            //------------------------------------------------------------------

            string ID;

            if(filterMessage(mailData)) {

               if(recipientList != "") {

                  if(mailData.length() > 0) {

                     //------------------------------------------------------------------
                     // We have the message and we have a list of recipients. Send the
                     // message to the queue since we know everyone in the recipient
                     // list has passed the test.
                     //------------------------------------------------------------------
                                          
                     ID = queueMail(sender, recipientList, mailData, clientIP, log, sql, "N");

                     if(ID != "") {

                        log.message("Response: 250 OK Queued message " + ID);

                        //------------------------------
                        // Tell the client we sent it.
                        //------------------------------

                        cout << "250 OK Queued message " << ID << CRLF;
                     }
                     
                     else {

                        log.message("Response: 550 Mail message too big.");

                        //---------------------------------
                        // Tell the client it was too big.
                        //---------------------------------

                        cout << "550 Mail message too big" << CRLF;
                     }
                     
                  }  
                  
                  //------------------------------------------------------------------------
                  // The mail message is empty so we are going to error out. We don't like
                  // getting empty messages.
                  //------------------------------------------------------------------------

                  else {

                     log.message("Response: 550 Mail message was empty.");
                     cout << "550 Mail message was empty" << CRLF;

                  }
                                    
               }  
               
               else {

                  log.message("Response: 250 OK Queued message. (We actually discarded it due to empty recipient list)");

                  //------------------------------
                  // Tell the client we sent it.
                  //------------------------------

                  cout << "250 OK Queued message " << ID << CRLF;

               }
               
            }  

            //----------------------------------------------------
            // Error out cause it did not pass the filter test.
            //----------------------------------------------------

            else {

               cout << "550 Message is probably spam" << CRLF;
               log.message("Response: 550 Message is probably spam.");
            }

            //----------------------------
            // Return to the READY state.
            //----------------------------

            state = "READY";
         }
                 //--------------------------------------------------------
         // Generate an error cause we are not in the right state.
         //--------------------------------------------------------

         else {

            if(state == "MAIL") {
               cout << "503 Please use RCPT first" << CRLF;
               log.message("Response: 503 Please use RCPT first.");
            }

            else {
               cout << "503 Please use MAIL first" << CRLF;
               log.message("Response: 503 Please use MAIL first.");
            }

         }
      }