On 12/05/2025 17:50, John Levine wrote:
It appears that Alessandro Vesely <[email protected]> said:
When you deliver a message, if you want to undo that particular change to make
it easier to reply to list messages, that's not a bad idea, and it's something
I've been doing for years on my mail system.
Yup, it's a curious protocol. The forwarder munges From: and the receiver
restores it, after DMARC evaluation. (Maybe someone should specify what header
field to use, Original-From:, X-Original-From:, Author:,...)
But it's not related to DKIM2*.
Let us not forget that one of the goals of DKIM2 is to make this kind of munging
unnecessary.
I also thought this was the desired solution to the mailing list
problem. In fact, since a DKIM2 verifier can verify the original
signature of the author's domain, it can issue a dmarc=pass in the face
of admissible transformations.
However, how does a list know which subscribers have a DKIM2 verifier?
We should still stick to the curious, though improved, protocol above.
Best
Ale
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