[Mailman-Users] Mailman and xmail

I just set up mailman and am pretty new to all three Linux, mailman and I use xmail as my mail server. When I create a new list it asks if I want to send a message to the list owner/administrator I tell it yes but it doesn't go anywhere. Where in mailman (other then in the mm-cfg.py file do I tell it where or what the mail server is

Thanks and a lot of questions thiscoming this way

Bob Escher