I got this type porblem once and the problem was "smtp relay was  open" . I just configured the relay from the properties of smtp virtual server and then  access tab then relay the i configured relay restriction.

regards

Anwar

---

From:  "Taylor, George" <GTaylor@xxxxxxxx>
Reply-To:  exchangelist@xxxxxxxxxxxxx
To:  <exchangelist@xxxxxxxxxxxxx>
Subject:  [ExchangeList] Re: Relaying mail but NOT an open relay... Compromised?
Date:  Mon, 17 Jul 2006 08:44:07 -0600
>http://www.msexchange.org
>-------------------------------------------------------Perhaps they are actually coming from an internal machine and spoofing
>the from address, as in you have an infected machine on your
>network....just a thought.
>
>George Taylor
>Systems Programmer
>Regional Health Inc.
>
>
>-----Original Message-----
>From: Tasita Ebacher [mailto:tebacher@xxxxxxxxxxxxxxxxxxxxx]
>Sent: Monday, July 17, 2006 8:31 AM
>To: exchangelist@xxxxxxxxxxxxx
>Subject: [ExchangeList] Relaying mail but NOT an open relay...
>Compromised?
>
>http://www.msexchange.org
>-------------------------------------------------------Hello all,
>
>
>I'm working on an Exchange Server 2003 server that appears to be sending
>mail like it's an open relay.  In the Message Tracking Center there are
>lots of messages (a few every minute) that are from external domains
>being sent to other external domains.
>
>The server is setup to NOT be relaying anything, and Relay tests have
>proved negative for being a relay.
>
>The client has even called Microsoft to get support on the server and
>they couldn't find any problem.  I just don't see how it's relaying
>mail...  Unless it's internally compromised somehow, but I can't see
>anything unusual.
>
>
>Has anyone ever seen anything like this before...??
>
>I appreciate any advice!
>
>Thank you,
>TE
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