smtpd_recipient_restrictions =
    permit_sasl_authenticated,
    permit_mynetworks,
    reject_invalid_hostname,
    reject_non_fqdn_sender,
    reject_non_fqdn_recipient,
    reject_unknown_sender_domain,
    reject_unknown_recipient_domain,
    reject_unauth_pipelining,
    reject_unauth_destination,
    reject_rbl_client sbl-xbl.spamhaus.org,
    #reject_rbl_client list.dsbl.org,
    #reject_rbl_client cbl.abuseat.org,
    #reject_rbl_client relays.ordb.org,
    #reject_rbl_client zombie.dnsbl.sorbs.net,
    #reject_rbl_client opm.blitzed.org,
    #reject_rbl_client sbl.spamhaus.org,
    #reject_rbl_client blackholes.easynet.nl,
    check_policy_service inet:127.0.0.1:10023,
    permit