Mail/DNS Problem on Cobalt Raq3 Mail returned

[Davefm]

I am not sure if this is a DNS Problem or a Sendmail or a Perl Problem. But here goes ... Mail that is sent using "sendmail" or "smtp" has the following information:
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Return-Path: <raquser>
Received: (from raquser@localhost)
by ns1.clubtbl.com (8.9.3/8.9.3) id CAA16892;
Fri, 24 Aug 2001 02:50:57 -0400
Date: Fri, 24 Aug 2001 02:50:57 -0400
--------------------------------------

I have been told that some mail servers will not accept the mail before the the @localhost, The Name Server seems to be running well and the Cobalt Raq3 is up to date on all the updates. The Cobalt OS is 5.0.

With the following above:
Return-Path: <raquser>
Shouldn't it read
Return-Path: <userid@domain.com>
Instead of the UserID on the Virtual site?

And shouldn't this:
Received: (from raquser@localhost)
read as
Received: (from raquser@domain.com)
instead of localhost?

Any help here would be greatly appreaceated! Thanks!

Dave