Exchange 2007 smtp logs question

VoyagerHealthCare used Ask the Experts™
Single server Exchange 2007 config

How do I  see all mail that hits the server from outside. I am being told that some people are not receiving SOME of their mail from a particular domain outside. They get the mail sometimes and sometimes not. I need to know which logs to look at and what needs to be turned on to look. I would like as much detail as possible.
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