How to deny smtp sessions to unavailable email-addresses at smtp level?

Hi there,

I need to be able to deny smtp sessions to my Exchange 2000 server at communication levels. I wish to receive a:

550 Invalid recipient: <XXXXXXX@domain.com>

But instead I receive a OK message and the server just sends a ndr afterwards.. I really hope to get exchange 2000 to also give a 550 Invalid recipient: <XXXXXXX@domain.com>.

Is this possible?
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phylaxictAsked:
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SembeeCommented:
Exchange 2000 can't do that on its own. Exchange 2003 can.
To achieve the same on Exchange 2000 you will need to use a third party tool that can do directory lookups. GFI Mail Essentials and ORF from Vamsoft can both do that (Vamsoft is charged on a per server basis so could be cheaper for you).

Simon.
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phylaxictAuthor Commented:
Ok thanks for the respond.
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