my_networks= my_hostname= smtpd_helo_required=yes smtpd_sender_restrictions smtpd_client_restrictions smtpd_relay_restrctions smtpd_helo_restrictions smtpd_etrn_restrictions smtpd_data_restrictions smtpd_sender_restrictions # unknown reject_unknown_client reject_unknown_client_hostname reject_unknown_reverse_client_hostname reject_unknown_hostname reject_unknown_sender_domain reject_unknown_recipient_domain reject_unknown_helo_hostname # hostname reject_unknown_helo_hostname reject_unknown_hostname reject_invalid_hostname reject_unknown_client_hostname reject_unknown_reverse_client_hostname reject_unknown_helo_hostname reject_non_fqdn_hostname # non_fqdn reject_non_fqdn_hostname reject_non_fqdn_sender reject_non_fqdn_recipient # unauth reject_unauth_destination reject_unauth_pipelining check_policy_service