[Mailman-Users] Changed Firewall and Now Mailman is not working

[Brian Maull]

Hello,
  We changed the firewall in our network and now our mailman installation is no longer working.  From the server mailman is installed on I can access the internet just fine, so DNS and the default gateway are functioning.
  
Is there anything in the mailman setup or in Red Hat 9 that I should check to see if it is pointing at my old firewall?
  Thanks,
  Brian