Return Path different than "From" address

I have an AIX server that is in my domain that I allow to relay through my Exchange 2003 server.  All is fine except when I look at the headers, the return path is different that the "From" address.  I have looked at the CFG file on the AIX server and all is in order there.  Below is a sample of the header file:

Microsoft Mail Internet Headers Version 2.0

Received: from cpfcp615.mdvnf.com ([128.5.0.5]) by exch1.mdvcorp.mdvnf.com with Microsoft SMTPSVC(6.0.3790.3959);

      Wed, 5 Dec 2007 09:59:07 -0500

Received: (from root@localhost) by cpfcp615.mdvnf.com (AIX5.2/8.11.6p2/8.11.0) id lB5Exwl13972 for ranga@mdvnf.com; Wed, 5 Dec 2007 09:59:58 -0500

Date: Wed, 5 Dec 2007 09:59:58 -0500

From: root@mdvnf.com

Message-Id: <200712051459.lB5Exwl13972@cpfcp615.mdvnf.com>

To: ranga@mdvnf.com

Subject: RICH

Return-Path: root@mdvcorp.com

X-OriginalArrivalTime: 05 Dec 2007 14:59:07.0410 (UTC) FILETIME=[6278FF20:01C8374F]

Thoughts on how this is occurring or how to fix?
redcell5Asked:
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Stacy SpearConnect With a Mentor President/Principal ConsultantCommented:
All is fine according to that. AIX mail is being sent to localhost, so it shows received from root@localhost. Change the smtp config on AIX to send to its FQDN name and that should change. Also insure that its local mail server will respond on that as well.
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