We installed domino version 8 in a new windows 2003 server and having problems with the Port 25.
12/01/2008 10:29:53 PM SMTP Server: Another application is already listening on port 25: 220 DOMSERVER01.local Microsoft ESMTP MAIL Service, Version: 6.0.3790.3959 ready at Mon, 1 Dec 2008 22:29:52 -0800
2/01/2008 09:00:06 PM SMTP Server: Listener failure, TCP/IP port number [25] is already in use on this system
2/01/2008 09:00:06 PM Suspending listen task for 20 seconds due to network errors
Other than the new domino server you just created is there another mail server running within your local subnet?
Are there any other applications running on the same server? (e.g. IIS, Apache)check your services (windows) and check if SMTP is running or any application associated with SMTP.