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Re: [ietf-smtp] Who should set the Sender: header field?

2021-12-17 08:17:54

--On Friday, December 17, 2021 13:18 +0100 Alessandro Vesely
<vesely(_at_)tana(_dot_)it> wrote:

On Fri 17/Dec/2021 04:10:43 +0100 John C Klensin wrote:
I would favor a statement in the proposed A/S about this (or
any similar feature) warning people that the feature is not
widely supported, that it cannot be expected to work
universally in an interoperable way, may result in mail being
bounced and/or lost, and hence should probably be avoided
unless the sender knows it will be handled properly at the
recipient end.  I'd be hesitant about removing the
construction from 5322bis entirely, but could be convinced.

Since G say they banned multi-mailbox From: after DMARC (with
no statement about how/if it worked before), perhaps if we
rewrite DMARC so as to not preclude the authentication of that
kind of messages, they might eventually restore the
functionality.  Authenticating the sender of a multi-mailbox
From: message does not suggest that its end-to-end flow is
likely to work, but neither denies it.

Please take that comment/ suggestion to the DMARC WG [1].  At
least IMO, discussion on this list is not likely to be helpful
in shaping DMARC/ARC.



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