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after always arrives away backup bit block Blocking But but cannot changing come Come configure connection connections day delay delayed demand greylist Greylisting greylisting having higher iptables known latency Obviously often once point postgrey process real retry returns save saves section seem spammers Spammers sqlgrey style system

directly disadvantage error fake Fake fast first good got helping highest idea immediately increment Instead ipfilter Later later less Long lots lowest maybe minutes ms much never numbered receives record Records records rejects relate seen send sent servers single slow some spammer supposed tell temporary than then there Trick trick tricks wait