Dnia 10.02.2024 o godz. 07:52:43 Sebastian Nielsen via mailop pisze:
> Try it yourself in your email software.
> Click Forward.
> Sending this email will basically rewrite the headers and add Fwd: into
> subject.
> 
> You can also click "Forward as an attachment", which will forward the
> original email unmodified as a message/rfc822 object.
> 
> This transfer the responsibility for the message to the forwarder, which
> means all DKIM, SPF and DMARC signatures are verified against the
> forwarder and not original sender.

Which is true and correctly reflects the actual reality in the case you
describe, ie. if a HUMAN, MANUALLY, KNOWING the message contents, forwards
an email to someone.

The automatic forwarding by the server is a completely different thing.
Conceptually, it's more like a HTTP proxy server. One cannot claim that the
owner of the proxy server assumes any responsibility for the contents of
webpages fetched via the proxy, and similarly one cannot claim that
forwarder assumes any responsibility for the CONTENTS of the message in this
case. So the message definitely should keep the original sender's From:.
-- 
Regards,
   Jaroslaw Rafa
   [email protected]
--
"In a million years, when kids go to school, they're gonna know: once there
was a Hushpuppy, and she lived with her daddy in the Bathtub."
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