On 2024-01-21 09:29, Michael Peddemors wrote:
On 2024-01-21 04:43, Patrick Domack via dovecot wrote:
Quoting Benny Pedersen <m...@junc.eu>:
Christian Kivalo skrev den 2024-01-21 02:08:
Just wish LMTP would not end up with duplicate Return-Path headers..
Duplicate return path headers? I don't see them on my system. All
mail is sent from postfix to dovecot with lmtp
it simply works better with lda ? :)
return-path is std postfix envelope sender pseudo header, bugs ?
it's not a pseudo header, it is defined starting in rfc-822, as to be
added at time of delievery.
The LDA should add it, postfix lda add it (virtual/local) and dovecots
do also (lda/lmtp)
I have used most postfix versions from 2.1 to 3.8 and dovecot lda and
lmtp and haven't have never seen duplicate headers
Maybe it is just a Zimbra thing.. but we definitely see this occurring
in the wild.. Maybe just poor configuration, but of course as per RFC,
to be clear, is only supposed to be added by the 'final' delivery
mechanism.
So, the logic that implies duplicate Return-Path either indicates a
broken system, looping issue, or email replay fails in those situations.
Postfix adds...
Return-path: <REDACT>
Envelope-to: <REDACT>
Delivery-date: Fri, 06 Oct 2023 08:56:07 -0300
<Trace Headers>
After which it get handled by lmtp, which adds the following..
Return-Path: <REDACT>
Delivered-To: <REDACT>
Received: from <SVR NAME>
by <SVR NAME> with LMTP
id CMvDLNf1H2UcHQAAJRWI5g
(envelope-from <REDACT>)
for <REDACT>; Fri, 06 Oct 2023 08:56:07 -0300
I guess this is a double issue, postfix should know that in this case,
it is not the final delivery, lmtp is.. and lmtp should probably either
remove the previous Return-Path, or copy that to a new header.. since it
was not supposed to be there (but that has ramifications too.
Also just observed in DirectAdmin, Exim->LMTP as well, but since this is
a bit off topic for this list, just mentioning it quickly..
Return-Path: <j...@sendingdomain.com>
Delivered-To: re...@recipdomain.com
Received: from <LOCALHOSTNAME>
by <LOCALHOSTNAME> with LMTP
id IdtjNTOesWWKyQUA9oBGDw
(envelope-from <j...@sendingdomain.com>)
for <re...@recipdomain.com>; Wed, 24 Jan 2024 15:33:07 -0800
Return-path: <j...@sendingdomain.com>
Envelope-to: re...@recipdomain.com
Delivery-date: Wed, 24 Jan 2024 15:33:07 -0800
Received: from mail.remote.com ([REMOTE_IP])
by <LOCALHOSTNAME> with esmtp (Exim 4.97.1)
(envelope-from <j...@sendingdomain.com>)
id 1rSmjz-00000001amd-3RDT
for re...@recipdomain.com;
Wed, 24 Jan 2024 15:33:07 -0800
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