If he's only complaining about not getting external email, you might check that 
DL and see if it's set to only accept mail from authenticated senders.

From: Joseph L. Casale [mailto:[email protected]]
Sent: Tuesday, January 18, 2011 6:24 PM
To: MS-Exchange Admin Issues
Subject: Some recipients of a DL not getting mail

I have a user who is suggesting they are not getting external mail sent to the 
smtp address of a Dl they are a member of.
Message tracking my best at looking into this?
Exchange 2010 sp1

Thanks!
jlc

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