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Greylisting with PF
This article will show you how I am using PF (the Packet Filter from the OpenBSD project) and spamd (also from OpenBSD) to implement greylisting and greatly reduce incoming spam (hits: 476)
Url: http://www.onlamp.com/pub/a/bsd/2007/01/18/greylisting-with-pf.html
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