smtpd_recipient_restrictions =
    reject_unknown_sender_domain,
    reject_unknown_recipient_domain,
    permit_mynetworks,
    permit_sasl_authenticated,
    warn_if_reject reject_non_fqdn_hostname,
    warn_if_reject reject_unverified_recipient,
    warn_if_reject reject_non_fqdn_recipient,
    warn_if_reject reject_unlisted_recipient,
    reject_unauth_destination,
    warn_if_reject reject_rbl_client relays.ordb.org,
    warn_if_reject reject_rbl_client list.dsbl.org,
    warn_if_reject reject_rbl_client sbl.spamhaus.org,
    warn_if_reject reject_rbl_client cbl.abuseat.org,
    warn_if_reject reject_rbl_client dul.dnsbl.sorbs.net,
    permit