Querying other SMTP server for valid addresses?

[Jan-Peter Koopmann]

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>>> I don't know if Exchange 2000 or 5.5 can be configured to reject
>>> mail for invalid users. 

No way.

> This is what I was afraid of and the information in the like
> above seems to prove this is true. Looks like LDAP is the
> only option for Exchange 5.5 and 2000

Or you can periodically extract all valid e-mail adresses from the Exchange 5.5 Directory or the Active Directory, push this to your gateway and do a local database lookup. That way you will not need to allow incoming LDAP on your firewall.

Scripts etc. for this should be in the FAQ/MAQ.

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