text_combined: vvrpgsporcupineorg cedric knight greennet charset iso88591 unsupported converting noel jones wrote cedric knight greennet wrote way look reverse_name table instead limiting verified hostnames postfix doesnt check_reverse_client_access lookup unverified hostnames cant used safely whitelisting use write policy server rejects clients based reverse hostname believe policyd ability along many others httpwwwpostfixorgsmtpd_policy_readmehtml httpwwwpostfixorgaddonhtmlpolicy httppolicydsourceforgenet patch source code add new lookup type particular mod looks fairly easy thanks makes options clear fact one purposes preventing connections getting far policy stage case gps greylisting avoiding relatively cpuintensive database lookups maybe ill request feature meantime may break banned hostnames ip24 blocks someone might want try cloning 5 lines srcsmtpdsmtpd_checkc else is_map_commandstate name check_client_acl cpp status check_namadr_accessstate cpp statename stateaddr full found statenamaddr smtpd_name_client def_acl suitable replacements statename check_client_acl smtpd_name_client perhaps could also similar cloning operation protopostconf5html protosmtpd_access_readme check_client_acl appears part warning message would need updating rationale access map lookups reverse client name worse access map lookups helo argument wietse tue 05 aug 2008 214413 0500 access table unverified hostnames