Single user not receiving external email

I am in the middle of a migration from SBS 2003 to SBS 2011.  The migration is going fine and I have had no errors or problems thus far.  I have already migrated user mailboxes to the new server and all users except one is receiving external mail.  This user can receive internal email without a problem but not external.  I have tested send emails from external email sources and I do not get any type of bounce back messages.  I have checked mailbox size quotas and this does not seem to be the problem.
What else can i check, your help is greatly appreciated.
darleesonAsked:
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JerCommented:
I assume that the user has no rules enabled and that the email is not showing up in another account (such as a catch-all account)?
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suriyaehnopCommented:
You may use message tracking log to track where the email go?With no bouncing message, it seem to me that the message already reach the user's mailbox. You may also check the Outlook rule settings
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darleesonAuthor Commented:
Jer, yes no rules are enabled and there are no catch all accounts where the emails may be caught.

Suriyaehnop, I will check the try the message log tracking.
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darleesonAuthor Commented:
Thanks Jer, indeed there was a rule enabled
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