[Mailman-Users] Lists in OSX

[Derrick Seymour]

I am trying to configure mailing list in Mac OSX Server 10.3.5.  I am having
trouble posting to the list, or I should say my test users are having
trouble.  Upon posting to a list this message is sent back:

This is the Postfix program at host test.org.

I'm sorry to have to inform you that the message returned
below could not be delivered to one or more destinations.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the message returned below.

            The Postfix program

<test at server.test.org>: mail for server.test.org loops back to myself

Reporting-MTA: dns; test.org
Arrival-Date: Thu, 30 Sep 2004 13:34:37 -0400 (EDT)

Final-Recipient: rfc822; test at server.test.org
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; mail for server.test.org loops back to myself




I am quite green at this and any help would be appreciated

Thanks

Derrick