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smtpd_recipient_restrictions =
        permit_mynetworks,
        permit_sasl_authenticated,
        check_client_access cidr:/etc/postfix/dnswl-permit,
        reject_invalid_hostname,
        reject_non_fqdn_hostname,
        reject_non_fqdn_sender,
        reject_non_fqdn_recipient,
        reject_unknown_recipient_domain,
        reject_unauth_pipelining,
        reject_unauth_destination,
        reject_rbl_client zen.spamhaus.org,
        reject_rbl_client list.dsbl.org,
        reject_rbl_client cbl.abuseat.org,
        reject_rbl_client bl.spamcop.net,
        reject_rbl_client dnsbl.njabl.org