Postfix users wrote in
 <4z1fyh6j5nzj...@spike.porcupine.org>:
 |Steffen Nurpmeso via Postfix-users:
 |> Yes, unfortunately online on a Sunday, i should better have let
 |> it.  Anyhow.  I wanted to ask for long why postfix does not
 |> support the RFC 9057 Author: header, as it fixes a miss that
 |> starts with DomainKeys, and goes on ever since, and reached the
 |> mountaintop of madness with the advent of DMARC.
 |
 |RFC 9057 appears to target MUA developers, not MTA developers. See
 |https://www.rfc-editor.org/rfc/rfc9057.html#name-experimental-goals

An originator that has to add From: is well in the condition to
place the Author: alongside.
(The former is subject to change, or not, which is worse, if an
existing DKIM signature was broken.)

 |If a message contains Author:, then Postfix will preserve it unless
 |configured otherwise.  The header receives no special treatment and
 |its contents are not subject to address rewriting.

Yes i know.  My MUA places it since 2021.

--steffen
|
|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)
|
|In Fall and Winter, feel "The Dropbear Bard"s pint(er).
|
|The banded bear
|without a care,
|Banged on himself for e'er and e'er
|
|Farewell, dear collar bear
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