1 domian blocked in Exchange, but not in Blackberry Enterprise?

I have an Exchange 2003 server running on SBS 2003 that will not deliver mail from one specific domain. the mail headers from the blocked domain show absolutely nothing unusual when received on another mail service. Here's the twist: the server is also running Blackberry Enterprise Server, and email from the domain DOES get delivered to user's handhelds.

the installation is totally stock, all patches applied- I've tried archiving the undelivered mail, cranking the IMF way down, and nothing. the mail from this one specific domain just vanishes w/o a trace, yet I know it''s hitting the server, since it goes to the handheld. any ideas?

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peakpeakConnect With a Mentor Commented:
Are you using a RBL? Disable it as a test.
Also turn on Message Tracking, very handy:  http://www.computerperformance.co.uk/exchange2003/exchange2003_message_tracking.htm
ANy Anti-virus or content filtering on the Server ?

I hope this helps !
As a matter of fact, I'd love to have that problem on my own server, the messages from that domain are not  lost, they are somewhere
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If the messages are seen on the Blackberry but not in Outlook then the messages are in Exchange somewhere. Rule, view etc could be hiding the messages. BES is just an extension of the mailbox - it doesn't send the messages to the device.

I agree with you Sembee, they are somewhere. Hidden but possible to find
TechRescueAuthor Commented:
Thanks for the comments - I have enabled message tracking and  NDR to my own mailbox, and am waiting for the offending domain to generate some traffic for me and hopefully show me the way out.  There is Trend Micro Corporate antivirus, but no anti-spam or RBL except for IMF. I will respond ASAP.
TechRescueAuthor Commented:
The acce[ted answer has put ,e on the right track; thanks!
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