see also: The surprising effectiveness of simply asking the spam server to try again(sometimes called graylisting). It shouldn't work at all, but proves to filt

see also: The surprising effectiveness of simply asking the spam server to try again(sometimes called graylisting). It shouldn't work at all, but proves to filter an awful lot of the worst mail noise. http://man.openbsd.org/spamd http://man.openbsd.org/spamd