Block Spam Menggunakan Postfix

Untuk memblok mail spam menggunakan postfix dapat ditambahkan baris berikut di /etc/postfix/main.cf

check_helo_access hash:/etc/postfix/maps/helo_access,
 reject_rhsbl_sender cbl.abuseat.org,
 reject_rhsbl_sender dnsbl.njabl.org,
 reject_rhsbl_sender list.dsbl.org,
 reject_rhsbl_sender bl.spamcop.net,
 reject_rhsbl_sender cbl.abuseat.org,
 reject_rhsbl_sender dul.dnsbl.sorbs.net,
 reject_rhsbl_sender rhsbl.sorbs.net,
 permit

smtpd_client_restrictions=
 reject_rbl_client cbl.abuseat.org,
 reject_rbl_client dnsbl.njabl.org,
 reject_rbl_client list.dsbl.org,
 reject_rbl_client bl.spamcop.net,
 reject_rbl_client cbl.abuseat.org,
 reject_rbl_client dul.dnsbl.sorbs.net,
 reject_rbl_client rhsbl.sorbs.net,
 permit_mynetworks,
 permit