Something

sysadm@spamwall:~$ postconf | grep -i _restrictions
smtpd_client_restrictions = reject_rbl_client zen.dnsbl, permit
smtpd_data_restrictions = reject_unauth_pipelining
smtpd_end_of_data_restrictions =
smtpd_etrn_restrictions =
smtpd_helo_restrictions =
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_unauth_pipelining
smtpd_sender_restrictions = check_sender_access hash:/etc/postfix/sender_access, reject_authenticated_sender_login_mismatch, reject_non_fqdn_sender, reject_unknown_sender_domain