issue with extra top level domain appened to mail

[Matthew Davidson [DATACOM]]

Greetings 
 
I have a problem with a vanlia 6.3/6.4 install that any mail generated
gets an extra top level domain appended to the domain.
 
This is causing mail delivery failures and much frustration.
 
Here is my box....
MATDAV# uname -a
FreeBSD MATDAV.datacom.net.nz 6.3-RELEASE FreeBSD 6.3-RELEASE #0: Wed
Jan 16 04:18:52 UTC 2008
root at dessler.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386
 
Say for example I used the mail shell script...
MATDAV# mail -s TESTING someone at datacom.co.nz
this is a test
EOT
 
The resulting email is "from" Charlie Root
[root at MATDAV.datacom.net.nz.net.nz]
 
Here are the headers....
Microsoft Mail Internet Headers Version 2.0
Received: from mx6.datacom.co.nz ([202.175.142.6]) by
dnzwgex1.datacom.co.nz with Microsoft SMTPSVC(6.0.3790.3959);
  Fri, 9 Jan 2009 10:14:21 +1300
Received: from MATDAV.datacom.net.nz (Not Verified[202.175.143.252]) by
mx6.datacom.co.nz with MailMarshal (v6,4,1,5038) (using TLS: SSLv23)
 id <B49666cad0000>; Fri, 09 Jan 2009 10:14:21 +1300
Received: from MATDAV.datacom.net.nz (localhost.datacom.net.nz
[127.0.0.1])
 by MATDAV.datacom.net.nz (8.14.2/8.14.2) with ESMTP id n08LELbj002945
 for <someone at datacom.co.nz <mailto:someone at datacom.co.nz> >; Fri, 9 Jan
2009 10:14:21 +1300 (NZDT)
 (envelope-from root at MATDAV.datacom.net.nz.net.nz
<mailto:root at MATDAV.datacom.net.nz.net.nz> )
Received: (from root at localhost <mailto:root at localhost> )
 by MATDAV.datacom.net.nz (8.14.2/8.14.2/Submit) id n08LEL2D002944
 for someone at datacom.co.nz <mailto:someone at datacom.co.nz> ; Fri, 9 Jan
2009 10:14:21 +1300 (NZDT)
 (envelope-from root)
Date: Fri, 9 Jan 2009 10:14:21 +1300 (NZDT)
From: Charlie Root <root at MATDAV.datacom.net.nz.net.nz
<mailto:root at MATDAV.datacom.net.nz.net.nz> >
Message-Id: <200901082114.n08LEL2D002944 at MATDAV.datacom.net.nz
<mailto:200901082114.n08LEL2D002944 at MATDAV.datacom.net.nz> >
To: someone at datacom.co.nz <mailto:someone at datacom.co.nz> 
Subject: TESTING
Return-Path: root at MATDAV.datacom.net.nz.net.nz
<mailto:root at MATDAV.datacom.net.nz.net.nz> 
X-OriginalArrivalTime: 08 Jan 2009 21:14:21.0546 (UTC)
FILETIME=[132D84A0:01C971D6]
 

Is seems that something (sendmail?) is appended an extra TLD '.net.nz'
on the EVELOPE-FROM field.
 
If I rebuild the box using 6.1 it works no problem at all.
 
Anyone know of and previous post regarding this?
 
Any advice would be much appreciated.
 
Matt