How to tell if outside email made it to my exchange server?

[ingrammusic]

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

[ingrammusic]

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??