Alf Vark: > > > > Postfix implements loop detection on port 25. If you run your filter > > on an alternate port, the HELO name will not be a problem. > > > > Confirmed! > > Do the docs mention that difference? I must have missed it. Thanks for > the pointer.
Apply common sense. Postfix cares about mailer loops as in: a destination MTA greets with the same name as the sending MTA. MTA service is on port 25. Other ports don't count as MTA service, therefore loop detection does not apply. Wietse