Hi All. I have a few instances where servers attempting to send email to me report a bad fqdn during the helo process. 554 5.7.1 <server.urichoffice.local>: Helo command rejected: Host not found; from=<[email protected]> to=<destinaion@mydomain> proto=ESMTP helo=<server.urichoffice.local> My Main.cf contains: smtpd_helo_required = yes smtpd_helo_restrictions = permit_mynetworks, reject_non_fqdn_hostname,reject_invalid_hostname,permit smtpd_sender_restrictions = check_sender_access regexp:/etc/postfix/tag_as_originating.re , permit_mynetworks, permit_sasl_authenticated, check_sender_access mysql:/etc/postfix/mysql-virtual_sender.cf, check_sender_access regexp:/etc/postfix/tag_as_foreign.re Trying to understand where I can put this "server.urichoffice.local" as a whitelisted thing