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From: User Ernie <ernie@puremail.eis.net.au>
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Subject: Whitelist-only email server
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Has anybody set up a whitelist-only email server on FreeBSD that rejects all
emails except ones that are in the users personal whitelist?

I am trying to figure out how to do it, I know it's an anti-spam solution 
for advanced email users who understand the implications of what
legitimate emails they might miss as a consequence.

- Ernie.