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Hey Andy,
> How DKIM works is in an RFC, but how to operationally use it isn't,
> so much. It's not universally agreed that mailing list operators
> SHOULD (or MUST) NOT change the subject lines as the emails go
> through. Not every mailing list operator believes that, and there is
> no standard to tell them they are right/wrong.
What I meant is that any party who consciously alters from/subject or other
components signed by DKIM has a duty to re-align things as well (by re-signing,
or dropping the signature).
If nothing else, because this affects deliverability and it’s in the interest
of an ML operator to ensure subscribers do get emails - no?
> So you're asking on the basis of it being obvious to you, but it's
> not obvious. Nevertheless it's a decision to make for mailing lists
> in the DKIM and DMARC era.
Do you disagree with the statement that a server processing a DKIM-signed email
in ways which break the DKIM signature and still not taking action towards it
is an (implicit) breach of the RFC?
Thanks
Giorgio
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