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Private IP in Relayed Message

Asked by benhar in Miscellaneous Security, Exchange Email Server, Postfix

Tags: Exchange 2003, postfix, smtp

I have setup a server with phpList setup to relay messages through my Exchange server using Postfix.

When I send a message looking at the header of the email, my private IP and computer names are shown. (see the last two entries).

Received: from mail.mydomain.com (mail.mydomain.com [my.domain.ip.number])
   by nlpi077.prodigy.net (8.13.8 inb ipv6 jeff0203/8.13.8) with ESMTP id n9NE6nVP002547
   for <recipient@sbcglobal.net>; Fri, 23 Oct 2009 09:06:49 -0500
Received: from COMPUTER-NAME ([INTERNAL.IP]) by mail.mydomain.com with Microsoft SMTPSVC(6.0.3790.3959);
    Fri, 23 Oct 2009 09:06:48 -0500
Received: by COMPUTER-NAME (Postfix, from userid 33)
   id C8FA4E5C61; Fri, 23 Oct 2009 09:07:10 -0500 (CDT)

How do I prevent this from happening?
 
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