[Mailman-Users] domain names for list?

[Mark Greenlaw]

greetings Mailmen,

        	thank you much for the excellent software.  ive
installed it twice, the first time was flawless right out of the
box.  this second server im putting it on has been giving me one problem.

it seems the domain name is not set properly somewhere, can anyone assist
where i can adjust this?

maillog entry -

Dec 07 12:03:22 2001 (9568) All recipients refused: (553, '<testlist-admin@>... Domain name  +required', 'testlist-admin@')

best regards and thanks,
mark