Does anybody know how to tell if email from outside my network made it to my exchange 2003 server?

I have a user that can't receive email from anyone on the outside unless it's a reply message from one the user sent.

Thanks

Found it.

Message tracking in the Exchange System Manager. Search for the sender. Turns out that IMF was deleting the messages before they went to the users mailbox. Now I just have to figure out why I can send an email to that user and IMF will delete it, but another user on the same exchange server will receive it??

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