Building the Network You Need with OpenBSD's PF: BSDCan, Ottawa May 6th, 2009
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# Giving spammers a hard time (cont'd)

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