SBS 2003 eMail Vanishing?

I have a Windows 7 Pro 64 bit workstation that is receiving email on an SBS 2003 Exchange Server.  It connects via Outlook over HTTP.
We have email from domain xxxx.com that never shows up on the workstation.   Other people on the server receive email from the domain.  In fact the other workstation receives mail that's been cc'd to it's owner but the same cc for the workstation/user in question never comes in.
There is no external filtering in place.   Exchange Connectivity tests show that email to the address in question gets through.  The IMF has been set to take no action.  And the settings are set to 9.
I've gone through the junk email settings and Outlook rules and there's no settings that indicate email is getting deleted.   No blocked senders.   I've checked our Antivirus (Trend Micro Worry Free Business Advanced).  There's nothing presently installed on the SBS Exchange Server.  The Trend Micros end user client doesn't seem to have any features that deal with email.

I am allowed limited contact with the people who manage the xxxx.com domain or their end users so I can't gain too much info there.   The only thing that I can come up with is a possible outbound email filter from xxxx.com.   I think I've exhausted issues on my side.   I manage quite a few Exchange servers and have never seen an issue like this.   Am I missing anything?
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kdubendorfAsked:
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Alan HardistyCo-OwnerCommented:
Very odd!

Have you checked using OWA to see if the email is appearing on the Exchange server but not in Outlook?

Are there any rules setup in OWA that aren't appearing in Outlook?

Alan
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kdubendorfAuthor Commented:
OWA gives the same view as Outlook does.    There are no OWA rules either.   The junk email filter only as safe users on both the PC and OWA.

I agree this is strange.   The only explanation I can find is that they have some sort of Outbound Filtering in place at the other end.   Though why they'd be blocking us is beyond me.
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Alan HardistyCo-OwnerCommented:
Have you got Message Tracking enabled and have you reviewed the message tracking logs?

http://www.msexchange.org/articles-tutorials/exchange-server-2003/monitoring-operations/Exchange-2003-Message-Tracking-Logging.html

If not, please enable it and then ask the sender to send the message again and then see what happens to the message.

Alan
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