smtpd_client_restrictions =
        sleep 15,
        reject_rbl_client b.barracudacentral.org,
        reject_rbl_client zen.spamhaus.org,
        #reject_unknown_reverse_client_hostname,

smtpd_delay_reject = no

smtpd_sender_restrictions =
        reject_unknown_sender_domain,
        reject_non_fqdn_sender,

smtpd_recipient_restrictions =
        permit_mynetworks,
        check_recipient_access hash:/etc/postfix/recipient_access,
        reject_unauth_destination,
        check_policy_service inet:127.0.0.1:10023
        reject_invalid_hostname,
        reject_unauth_pipelining,
        reject_non_fqdn_recipient,
        reject_unknown_recipient_domain,

milter_default_action = tempfail