postscreen_access_list =
        permit_mynetworks,
        cidr:/etc/postfix/postscreen_access
# Jack - Above RBL
postscreen_dnsbl_sites = b.barracudacentral.org,bl.spamcop.net,all.spamrats.com,bl.spameatingmonkey.net,psbl.surriel.com,bl.score.senderscore.com
postscreen_dnsbl_threshold = 1
# Jack - below RBL
postscreen_dnsbl_action = enforce
postscreen_greet_action = enforce
smtpd_sender_restrictions =
        permit_mynetworks
        reject_non_fqdn_sender
        check_client_access     cidr:/etc/postfix/clientaccess
        check_sender_access     regexp:/etc/postfix/senderaccess
        check_recipient_access  regexp:/etc/postfix/rcptaccess
# Jack
        reject_unknown_reverse_client_hostname
# end Jack reject_unknown_sender_domain
smtpd_recipient_restrictions =
        permit_mynetworks
        reject_unauth_destination
        reject_non_fqdn_recipient
        check_recipient_access  regexp:/etc/postfix/rcptaccess check_sender_access  regexp:/etc/postfix/senderaccess
        # Jack
        check_sender_access     hash:/etc/postfix/sender_reject_domain
        check_client_access     cidr:/etc/postfix/sender_reject_ip
        check_recipient_access  hash:/etc/postfix/sender_reject_invalid
        # end Jack