smtpd_client_restrictions =
        permit_mynetworks,
        permit_sasl_authenticated,
        check_client_access pcre:/etc/postfix/rules/client,
        reject_unknown_client,
        reject_rbl_client dynablock.njabl.org,
        reject_rbl_client dnsbl.ahbl.org,
        reject_rbl_client relays.ordb.org,
        reject_rbl_client rbl.brasilrbl.com.br,
        reject_rbl_client opm.blitzed.org,
        reject_rbl_client all.rbl.jp,
        reject_rbl_client sbl-xbl.spamhaus.org