| PF, The OpenBSD Packet Filter: Building The Network You Need: BSDCan, Ottawa, June 10th 2015 | ||
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spamd
tarpit where black listed hosts get stuck - answers 1 byte at the time, tunable interval (-s option)
Grey-lists unknowns using 45n (temporary local error), well behaved ones are let through within a reasonable time
Introduced in OpenBSD 3.3 (May 2003)
Since OpenBSD 4.1, spamd runs in greylisting mode by default