how to block single user to send mails to one particular domain?

how to block single user to send mails to particular doamin
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Justin DurrantConnect With a Mentor Sr. Engineer - Windows Server/VirtualizationCommented:
Exchange 2003 cannot do this natively, however 2007 can.

Can you block via whoever handles your message hygiene?
singothuAuthor Commented:
i can't understand please explain in detail
Shreedhar EtteCommented:
You cannot do this Exchange 2003
Glen KnightCommented:
This question has been classified as abandoned and is being closed as part of the Cleanup Program.  See my comment at the end of the question for more details.
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