Envelope sender often manifests itself in the Return-Path:. This /should/ only
be added by the final delivering system based on the envelope sender as it was
handed the message, but who knows how many final delivery systems do add it,
and what do they do if an inbound message already has a Return-Path? You'd
have to do some experiments to learn how reliable that is, for each mailbox
system.
I agree envelope sender should also always be in the Received header generated
by the first-hop host (which may also have some means of verifying it). I have
the same complaint about the originally-addressed recipient too. In Office365,
I might have a number of addresses on my mailbox, but last time I had cause to
look there's no way to know from a received message which address was
originally used by the sender to get the message to that mailbox -- To: header
is not reliable, and perhaps you were blind-copied, potentially by a mailing
list.
In terms of MTAs, certainly Exim is programmable and can put whatever you want
in the headers. I don't know what the defaults are now**, but mine features
these clauses:
${if def:received_for \
{\n\tfor <$received_for>}}\
${if def:sender_address \
{ (return-path <$sender_address>)}}\
** Ah I see Thomas Mechtersheimen has clarified Exim's current default
behaviour.
Jethro.
. . . . . . . . . . . . . . . . . . . . . . . . .
Jethro R Binks, Network Manager,
Information Services Directorate, University Of Strathclyde, Glasgow, UK
The University of Strathclyde is a charitable body, registered in Scotland,
number SC015263.
________________________________
From: mailop <mailop-boun...@mailop.org> on behalf of MRob via mailop
<mailop@mailop.org>
Sent: 08 November 2022 23:10
To: mailop@mailop.org <mailop@mailop.org>
Subject: [mailop] Why no envelope sender in RECEIVED?
Hello,
Why isnt it standard to put the envelope sender into the RECEIVED
header?
Does any MTA do it?
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