robert fitzpatrick wluhewebtentnet tue 20080226 1925 0100 mouss wrote general aware consume lot smtpd processes verification slow slow destinations called verification checks lead reject sav instead sav consider spamblocker greylisting use sav selective accounts senderdoamins insist sav option raise limit smtpd process use verify probes default smtp well risk blacklisted abuse reliable way tell prober sav list washing participating distributed slow dictionary attack transport destinations control need gateway know user exists hand reduce filter load make sure customers transport server make sure server let us know asked possible restrict smtp us still stand chance abuse issues think still need selective known transports well since getting correct reject code 550 set guess getting hammered request thanks help robert thu 07 aug 2008 221139 0500 number rejections exploded