User can't receive outside email from one of her email addresses

We have a user who can't receive emails to her Inbox from outside users when they use her primary email address.  Her secondary email address works fine.  I spoke to Websense about it and they narrowed it down to the IP address of one of our EDGE servers.  The error message is SMTP 550 5.1.1 User unknown.

The EDGE server is Windows 2003 R2 64-bit.  Exchange 2007 Service Pack 2.
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johnm2595Connect With a Mentor Author Commented:
I removed the alternate aliases and the primary address started working correctly after that.
Vijaya Babu SekarAssociate Ops ManagerCommented:
Could you please check your sender\recipient address, whether it is valid or not.

You can use the below site for online email verification,

verify if you added accepted domain in Edge server.
Simon Butler (Sembee)ConsultantCommented:
Exchange 2007 SP2? I would start by updating the server.
Then check the subscription is still valid and the server has access to the internal network correctly.

johnm2595Author Commented:
This corrected the problem.
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