Re: Private IP Address from Exchange

["Buz Dale" <buz.dale () usg edu>]

The mail server has to establish two-way communication with any other
mail server it talks to.  In order to do this the other server must
know it's address (or it's proxy's address and port.) That's just the
way TCP works.  UDP...not so much.
Luck,
Buz

On 5/30/07, Danux <danuxx () gmail com> wrote:
> Hi experts!!!
>
> I dont know if it is a problem from Exchange but i thing so, let me explain...
>
> When i send a message from my local area to yahoo, the local ip
> address of my local mail box server is shown in Internet, i would like
> to know if there is a way to hide the local ip address.
>
> My client has Exchange Server SMTPSVC (6.0.3790.1830)
>
> Here is the Header i mentioned from Yahoo ->check how 192.168.0.106 is
> showed!!!:
>
> Take into account, we have a CheckPoint filtering out the connections
> (if you have a recommendation through this Firewall, i also has ISA
> Server)
> ------------------------------------------------------------------------
> From Danux Wed May 30 17:03:04 2007
> Return-Path: <danux () soluciones com>
> Authentication-Results: mta381.mail.re4.yahoo.com
> from=soluciones.com; domainkeys=neutral (no sig)
> Received: from 145.13.115.202  (EHLO smtp.soluciones.com) (145.13.115.202)
>   by mta381.mail.re4.yahoo.com with SMTP; Wed, 30 May 2007 17:03:06 -0700
> Received: from mailbox.soluciones.com ([192.168.0.106]) by
> smtp-out.soluciones.com with Microsoft SMTPSVC(6.0.3790.1830);
> Wed, 30 May 2007 19:03:05 -0500
> Content-class: urn:content-classes:message
> MIME-Version: 1.0
> Content-Type: multipart/alternative;
> boundary="----_=_NextPart_001_01C7A317.0F9CA09F"
> Subject: TEST
> Date: Wed, 30 May 2007 19:03:04 -0500
>
> -----------------------------------------------------------------------
> Finally its important to say that also the smtp-out.soluciones.com is
> a local ip inside my network like mailbox.soluciones.com, but the
> first one(smt-out.soluciones.com) doesnt get showed on Internet.
>
> How could i hide the local ip address??????
>
> Thanks in Advance for your help.
>
> Microsoft says "it is the way the protocol works!!!", following the related RFC.
>
> --
> Danux, CISSP
> Chief Information Security Officer
> Macula Security Consulting Group
> www.macula-group.com


--
Buz Dale                                buz.dale () usg edu
IT Security Specialist              1-888-875-3697 (In GA)
1-706-583-2005
Office of Information and Instructional Technology
University System of Georgia
GMT -5:00