> Since Xwall has no knowledge of the users on the system, it 
> accepts ALL
> stinking e-mail messages, and then forwards them to the Exchange box.
> Since spammers use blind name lists, attempting to get lucky, and hit
> all the possible [EMAIL PROTECTED], the Exchange Server wants 
> to send NDR
> reports to EACH and EVERY piece of Spam mail that comes into 
> the system.

You could try ORF from www.vamsoft.com - I've not used it but apparently it
hooks into Active Directory/LDAP at the "RCPT TO" to validate the recipient.
Another option, though not MS would be a linux/bsd MTA such as postfix, I
use this with an hourly export of the GAL and we reject around 7000 pieces
of mail a week to random/old addresses.

regards,
Paul

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