Contributed by sean on from the more pf articles than you can shake a stick at dept.
Dan Langille has written an article on using pf and spamd with greylisting - on FreeBSD. Anyway, it shows the usage of spamd and integration, a few basics of pf and a bit of troubleshooting. He mentions greyscanner from Bob at the end.
Even if it's on FreeBSD, maybe it is worth mentioning:
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