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From: Gary Mort (gmlugsaplings.us)
Date: Sun Jun 24 2007 - 12:28:59 CDT
BTW, regarding blocking invalid recipients at the border email server,
here is a set of instructions on how to do just that with Postfix.
It uses VB script on the exchange server to periodically generate your
user list(schedule it for daily running, or sooner if you need it) and
then send it up to your mail gateway and import/refresh periodically to
keep postfix in sync with the exchange server.
Of course, you could do LDAP lookups directly to the exchange server and
always be in sync, but as the article explains that has it's own problems.