my_networks= my_hostname= smtpd_helo_required=yes # client # sender # recipient # relay smtpd_client_restrictions smtpd_sender_restrictions smtpd_recipient_restrictions smtpd_relay_restrictions smtpd_data_restrictions smtpd_end_of_data_restrictions smtpd_etrn_restrictions # unknown reject_unknown_client reject_unknown_client_hostname reject_unknown_reverse_client_hostname reject_unknown_helo_hostname reject_unknown_hostname reject_unknown_sender_domain reject_unknown_recipient_domain # hostname reject_unknown_client_hostname reject_unknown_reverse_client_hostname reject_unknown_hostname reject_unknown_helo_hostname reject_non_fqdn_hostname reject_invalid_hostname # non_fqdn reject_non_fqdn_hostname reject_non_fqdn_recipient reject_non_fqdn_sender # sender reject_unknown_sender_domain reject_non_fqdn_sender # recipient reject_unknown_recipient_domain reject_non_fqdn_recipient # unauth reject_unauth_pipelining reject_unauth_destination check_policy_service permit_my_networks