When I try sending a message, I get the following:
If I turn off Verify Recipient, (non-spam) messages to any recipient will go be accepted.
220 mx.domain.com ESMTP ready.
HELO domain.ca
500 unrecognized command
HELO domain.ca
250 mx.domain.com Hello domain.ca [192.168.0.40]
mail from:z@domain.ca
250 OK
rcpt to:asdfer@domain.com
451 Please try again
I know that Exchange 2000 and below will not give an error 500 5.1.1 User Unknown if the user does not exist through SMTP. In the past, we have used an LDAP query to validate email addresses.
How can I get this feature to work with Exchange 2000? If this feature can't be used, the Exchange server will generate many Non-delivery receipts, and get flooded.
Thanks guys!
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