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exchange 2003 new users can't get external emails

icccadmin asked
Last Modified: 2013-11-30
Hi, I have an exchange 2003 box that seems to working great except for 2 new users that I just added.  These users can send, and receive messages internally.  However, they can't receive emails from external users.  The users show up in the global address book
and I have checked ad to make sure they can receive from all...when you send am email to them from outside our network:

Remote host said: 550 Requested action not taken: mailbox unavailable [RCPT_TO]

we are also running websense spam filter...again no other users are having an issue..thanks

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