hide private network info in out going mail header

When I send a mail from my outlook to gmail (to any external domain ) all of my private network information is revealed to internet . I am using exchange 2010 and outlook client is  ol2007.

How can i hide the header part of my mails . Atleast the client mechain name and ip .

This is how my header looks like from gmail (i replaced my original ips and client names)

Received: from mail.abc.com (mail.abc.com [111.11.11.111])
        by mx.google.com with ESMTPS id 37di489952obi.89.2011.02.11.22.34.28
        (version=TLSv1/SSLv3 cipher=OTHER);
        Fri, 11 Feb 2011 22:34:29 -0800 (PST)
Received-SPF: pass (google.com: domain of sender@abc.com designates 111.11.11.111 as permitted sender) client-ip=111.11.11.111;
Authentication-Results: mx.google.com; spf=pass (google.com: domain of sender@abc.com designates 111.11.11.111 as permitted sender) smtp.mail=senderh@abc.com
Received: from senderPCName (11.11.21.11 by mail.abc.com (111.11.11.111) with
 Microsoft SMTP Server (TLS) id 14.1.570.1; Sat, 12 Feb 2011 06:34:14 +0000
ivoicenetworksAsked:
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Glen KnightConnect With a Mentor Commented:
The reason you see that with OWA is because you are sending it from the Exchange Server.

You cannot hide the header information.
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Glen KnightCommented:
You cannot, this is by design to comply with the RFC requirements for the SMTP protocol
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ivoicenetworksAuthor Commented:
Dear demazter thanks for your reply !

When i send a mail from owa it shows only mail server ip  but not my pc name and ip . At least i want the same with my outlook.
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ivoicenetworksAuthor Commented:
Thank you
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