SenderPolicyFramework

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SPF

For postfix this may be of use it has a debian package dir so build a packages, install it and add in the entries to main.cf and master.cf from the README.Debina file.

http://www.openspf.org/
http://spf.pobox.com/postfix-policyd.txt

Links: thoughtsplurge/posts/2006/11/20/Dropping some spam

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