On Wed, Jul 29, 2026 at 10:55 AM Richard Clayton <[email protected]>
wrote:

>
> >Should alignment be satisfied if any valid signature in the chain aligns
> with
> >the From domain, or should the chain semantics introduce a different
> >interpretation?
>
> You are of course asking a question about DMARC not about DKIM2 -- and
> some people think that DMARC is not actually needed any more because
> what it is trying to protect is protected by the chain-of-custody -- so
> the only value DMARC has is the reporting features
>

Not to put too fine a point on things, but unless and until RFC 9989 is
updated to include DKIM2 as an Authentication Mechanism (
https://www.rfc-editor.org/rfc/rfc9989.html#name-authentication-mechanisms),
DKIM2 plays no role in DMARC. As far as I'm aware, there is no IETF working
group currently chartered to update DMARC to include DKIM2, and I would not
assume that such a working group would conclude its work quickly and
cleanly.

That said, in my opinion, alignment between a DKIM2 signature domain and
the RFC5322.From domain would have to be something checked at the
origination point of the message, but I am one of those people who think
that once DKIM2 is widely deployed, DMARC won't be needed anymore save
perhaps for its reporting features.

-- 
Todd
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