On Wed, 2 Dec 2020, Michael Thomas wrote:
Ignoring the existing usage of DKIM, DKIM+A-R would only work for a single
hop, and lead to some complication compared to the other DKIM signatures
already on the message.
Wait, what? a DKIM signatures survives until it encounters an intermediary
that alters the message in a breaking manner. Arc-Signatures are no different
in that respect. In fact as far as I can tell they are identical modulo the
i= difference.
Please reread the ARC spec. The ARC-Authentication-Results at level N
tells you whether the ARC and DKIM signatures were good at level N-1.
R's,
John
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