On Tue, 13 May 2025, Alessandro Vesely wrote:
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.

Right.

However, how does a list know which subscribers have a DKIM2 verifier?

They don't know, but I figure that's an incentive to get recipients to use DKIM2 so their list users are happy.

R's,
John

PS:

We should still stick to the curious, though improved, protocol above.

Um, I think you misspelled ugly hack that doesn't scale.

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