[Mailman-Users] Problems with outside users

[Plouffe, Robert]

Mailman,
	I am testing mailman on campus.  Our test users on campus work fine.
Test users with non campus accounts (yahoo, hotmail) are not able to join a
list much less receive mail.  Is there a setting I am missing in Mailman?  I
did send and receive email to these accounts with sendmail so I do not think
it a DNS etc issue. 

Any help would be appreciated -
Thank you,
Bob

Robert Plouffe
Assistant Director, Systems Support
Bridgewater State College
Bridgewater, Massachusetts 02325
rplouffe at bridgew.edu
(508) 531 2659