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