All-

I have a server that keeps sending these bouncebacks when someone tries to send 
to a contact with an external smtp address:

The following recipient(s) cannot be reached:

      Username on 1/22/2010 11:57 AM
            You do not have permission to send to this recipient. For
assistance, contact your system administrator.
            <exchangeserv.domain.com #5.7.1 smtp;550 5.7.1 Authentication
Required>
Thiis is a one Exchange 2003 server enviroment.  So not alot of hops in the 
routing structure.  The smtp connector is using DNS to send emails externally.

Any ideas?

TIA,

John Bowles

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