smtpd_client_restrictions =
permit_sasl_authenticated,
permit_mynetworks, reject_unknown_client,
check_sender_access regexp:/etc/postfix/sender_access,
reject_rbl_client dnsbl.sorbs.net,
reject_rbl_client zen.spamhaus.org,
reject_rbl_client dnsbl.ahbl.org,
reject_rbl_client sbl.spamhaus.org,
reject_rbl_client cbl.abuseat.org,
reject_rbl_client dnsbl.sorbs.net
smtpd_recipient_restrictions =
reject_unlisted_recipient,
reject_unverified_recipient,
check_recipient_access regexp:/etc/postfix/recipient_access,
permit_sasl_authenticated,
permit_mynetworks,
reject_unknown_recipient_domain,
reject_unauth_destination,
reject_unauth_pipelining,
reject_non_fqdn_recipient,
reject_non_fqdn_hostname,
reject_non_fqdn_sender,
reject_unknown_sender_domain