text_combined: cedric knight greennet oovhetgnapcorg hi id like reject connections certain spam sources residential ip blocks heavily infected dorf botnet sources quite welldefined reverse dns client example inserting access table ttnetnettr 554 much spam network dynamic163datacomcn 554 much spam network kdnyadsl 554 much spam network resrrcom 554 much spam network theory block lot parent_domain_matches_subdomains includes smtpd_access_maps domains dont need prefixed problem case forward dns doesnt exist isnt always available doesnt match client ip address shown logs postfixsmtpd6278 warning smtpd_peer_init 8823072217 hostname dsl8823018649ttnetnettr verification failed name service known postfix looks verified client hostnames access table entries either completely useless less useful hoped domains often include many different diverse ip ranges would difficult find add access table way look reverse_name table instead limiting verified hostnames postfix 215 debian stable thanks cedric knight wed 06 aug 2008 022321 0000 access table unverified hostnames