smtpListener = new ServiceListener( port, SMTPProcessor.class, executeThreads );
new Thread( smtpListener, "SMTP" ).start();
//Start the SMTPSender thread (This thread actually delivers the mail recieved
//by the SMTP threads.
smtpSender = new SMTPSender();
smtpSenderThread = new Thread( smtpSender, "SMTPSender" );
smtpSenderThread.start();
//Initialize ShutdownService
shutdownService = new ShutdownService();