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In message <b9029423-1b4a-4e82-b8ae-4acbbe810...@tana.it>, Alessandro
Vesely <ves...@tana.it> writes

>BTW, is dkim2=fail different from "failing DKIM2 signatures from a 100% DKIM2 
>mail chain"?  I mean, do verifiers always check all the signatures along the 
>chain or can sometimes check just the last one?

In DKIM2 you need to validate the signature of the entity passing you
the message (the highest numbered header field) because that assures you
that you can give it back to them if you need to...

... you then need to undo all the modifications in other header fields
(if any) but you don't need to check those signatures !

Then you can check the very first signature (if there is more than one
of course) and that tells you if the purported original sender did
indeed sign the message.

If you want to do forensics you can check more, but that's all that a
receiver is likely to care about.

- -- 
richard                                                   Richard Clayton

Those who would give up essential Liberty, to purchase a little temporary 
Safety, deserve neither Liberty nor Safety. Benjamin Franklin 11 Nov 1755

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