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551 This is not a relay host

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Last Modified: 2012-06-27
Ive setup an SMTP server on a windows 2000 pro PC, everything seems to be working ok, apart from when a user tries to email 1 particular user I get:-
     551 This is not a relay host

The recipient is on an external address, so it does have to go out, but seems to work ok, apart from this 1 user

The users email is apparently correct.

Im completly confused!

Tony
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Commented:
The exact error message is:-
Diagnostic-Code: smtp;551 This is not a relay host - mail must be to or from host domain.
IT Director
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