Mail Header is giving internal IP information

I have a DMZ server (smtp.domain.com) that is receiving email with MS-IIS from external and internal users.  It is then relayed internally (mail.domain.com) and then relaying back out the dmz server.  My problem is that my servers are attaching internal IP information (yyy.yyy and zzz.zzz IP addresses below) in the header of the emails.  How do I change this?  I would like to either not have the IP information at all, just the FQDN OR change yyy.yyy. and zzz.zzz. to external addresses OR some other suitable solution.  How do I do this?

This example is a users sending email to an external account (hotmail.com) from the internal network.

Received: from smtp.domain.com ([xxx.xxx.xxx.xxx]) by bay0-mc12-f15.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.2444);
       Tue, 13 Jun 2006 08:01:54 -0700
Received: from mail.domain.com ([yyy.yyy.100.8]) by smtp.domain.com with Microsoft SMTPSVC(6.0.3790.1830);
       Tue, 13 Jun 2006 11:01:50 -0400
Received: from smtp.domain.com ([zzz.zzz.0.2]) by mail.domain.com with Microsoft SMTPSVC(6.0.3790.1830);
       Tue, 13 Jun 2006 11:01:52 -0400
Received: from computer1 ([yyy.yyy.100.200]) by smtp.domain.com with Microsoft SMTPSVC(6.0.3790.1830);
       Tue, 13 Jun 2006 11:01:48 -0400

xxx.xxx.xxx.xxx is my external IP
yyy.yyy. is my internal network
zzz.zzz. is my dmz network.

Thanks,
  DAve
dauyeungAsked:
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SembeeCommented:
There is nothing that can be natively.
You would have to use something in the DMZ to clear the header information before sending the message out.

Personally I feel that if someone gets in to a position where they can use that information then you have bigger things to worry about.
Take a look at a lot of commercial messages that you may receive, you will see all sorts of header information. I know from experience that emails in to Gmail will have at least two internal IP addresses in the headers by the time they get to the mailbox.

Simon.
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