# client # sender # recipient # hostname # relay smtpd_client_restrictions smtpd_sender_restrictions smtpd_recipient_restrictions smtpd_relay_restrictions smtpd_helo_restrictions smtpd_data_restrictions smtpd_etrn_restrictions smtpd_end_of_data_restrictions # client reject_unknown_client reject_unknown_client_hostname reject_unknown_reverse_client_hostname # unknown reject_unknown_client reject_unknown_client_hostname reject_unknown_reverse_client_hostname reject_unknown_sender_domain reject_unknown_recipient_domain reject_unknown_hostname # domain reject_unknown_sender_domain reject_unknown_recipient_domain # sender reject_unknown_sender_domain # recipient # fqdn reject_non_fqdn_sender reject_non_fqdn_recipient reject_non_fqdn_hostname # unauth reject_unauth_pipelining reject_unauth_destination check_policy_service permit_mynetworks