Querying other SMTP server for valid addresses?

[Spicer, Kevin (MBLEA it)]

From: Steve Swaney [mailto:Steve.Swaney at FSL.COM] 
>I know that Exchange 2003 can be reconfigured to accept email only for
valid recipients 
>and not to issue NDRs. I seem to remember there is a MS Knowledgebase
article on how to 
>re-configure Exchange 2003 to behave a bit more sensibly. Obviously for
milter-ahead to 
>work, the back end mail hub has to reject email for invalid users.

I think I posted a link a while ago, should be in the archives (search
for exchange 2003 ?)

>I don't know if Exchange 2000 or 5.5 can be configured to reject mail
for invalid users. 
>Again if anyone has any tips or suggestions for configuring 2000 or
5.5, please let me 
>know.

As far as I have been albe to ascertain it can't, hence the LDAP routing
stuff.



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