On Tue, Dec 22, 2020 at 02:57:13PM -0600, John Schmerold wrote:
> I should have looked at the log before sending this note. Postfix is
> including a " orig_to=" header when sending to the destination server,
> that is causing our problem.
There is no such thing as an "orig_to=" header.
> Is there a way to turn off "orig_to=" in this situation?
That's the wrong question. If the remote server is unhappy with DSN
"ORCPT", you can ignore that ESMTP feature advertisement, but before
wasting your time with that, it would sure help to actually understand
what's wrong, rather than make random guesses.
- Capture and analyse traffic between Postfix and the remote server,
to understand how to reproduce the problem outside Postfix.
- Open a manual SMTP session to the remote server, reproduce the
problem, and then report your findings here. Depending on what
you've found, we can suggest viable alternatives.
- If the solution is obvious, try tweaking the manual SMTP interaction
to achieve the desired result, then see whether you can persuade
Postfix to send in a manner that the remote server will not object
to.
--
Viktor.
