bad.domain 554 match bad.domain friend.bad.domain OK bad-sender@ 554 match bad-sender@ bad-sender@good.domain OK good-sender@ OK 131.155.210 554 match 131.155.210 131.155.210.17 OK 131.155.210.19 REJECT reject@this.address 554 match reject@this.address open_user@some.site open strict_user@some.site strict auth_client 123456 dunno.com dunno foo.dunno.com reject 44.33.22 dunno 44.33.22.11 REJECT 44.33 REJECT reject@dunno.domain REJECT ok@dunno.domain OK dunno.domain DUNNO reject@reject.domain REJECT ok@reject.domain OK reject.domain REJECT reject@ok.domain REJECT ok@ok.domain OK ok.domain OK <> 550 Go away postmaster 54.187.136.235 reject bizsat.net, gypsysoul.org spam blackholes.mail-abuse.org $rbl_code client=$client client_address=$client_address client_name=$client_name helo_name=$helo_name sender=$sender sender_name=$sender_name sender_domain=$sender_domain recipient=$recipient recipient_name=$recipient_name recipient_domain=$recipient_domain rbl_code=$rbl_code rbl_domain=$rbl_domain rbl_txt=$rbl_txt rbl_what=$rbl_what rbl_class=$rbl_class rhsbl.porcupine.org $rbl_code client=$client client_address=$client_address client_name=$client_name helo_name=$helo_name sender=$sender sender_name=$sender_name sender_domain=$sender_domain recipient=$recipient recipient_name=$recipient_name recipient_domain=$recipient_domain rbl_code=$rbl_code rbl_domain=$rbl_domain rbl_txt=$rbl_txt rbl_what=$rbl_what rbl_class=$rbl_class dnswl.porcupine.org $rbl_code client=$client client_address=$client_address client_name=$client_name helo_name=$helo_name sender=$sender sender_name=$sender_name sender_domain=$sender_domain recipient=$recipient recipient_name=$recipient_name recipient_domain=$recipient_domain rbl_code=$rbl_code rbl_domain=$rbl_domain rbl_txt=$rbl_txt rbl_what=$rbl_what rbl_class=$rbl_class rejecttext@bad.domain reject text filter@filter.domain filter filtertext@filter.domain filter text filtertexttext@filter.domain filter text:text hold@hold.domain hold holdtext@hold.domain hold text discard@hold.domain discard discardtext@hold.domain discard text dunnotext@dunno.domain dunno text 64.94.110.11 reject Verisign wild-card topica.com reject 10.10.10.10 reject mail server 10.10.10.10 spike.porcupine.org reject ns or mx server spike.porcupine.org 241 reject class E subnet 4.1.1_dsn reject 4.1.1 reject 4.1.2_dsn reject 4.1.2 reject 4.1.3_dsn reject 4.1.3 reject 4.1.4_dsn reject 4.1.4 reject 4.1.5_dsn reject 4.1.5 reject 4.1.6_dsn reject 4.1.6 reject 4.1.7_dsn reject 4.1.7 reject 4.1.8_dsn reject 4.1.8 reject 4.4.0_dsn reject 4.4.0 reject user@4.1.1_dsn reject 4.1.1 reject user@4.1.2_dsn reject 4.1.2 reject user@4.1.3_dsn reject 4.1.3 reject user@4.1.4_dsn reject 4.1.4 reject user@4.1.5_dsn reject 4.1.5 reject user@4.1.6_dsn reject 4.1.6 reject user@4.1.7_dsn reject 4.1.7 reject user@4.1.8_dsn reject 4.1.8 reject user@4.4.0_dsn reject 4.4.0 reject