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In message <[email protected]
il.com>, Wei Chuang <[email protected]> writes

>I've written up this idea in a -04.  Please take a look in
>https://datatracker.ietf.org/doc/html/draft-chuang-dkim2-sender-policy-04.
>I've also removed the "unaligned" flag proposal.  Comments are very much
>welcome.

assuming no huge outcry about changes in -07 ...

You should leverage the concept of "Validly Signed DKIM2 Message" from
spec-07 in #2.2.2 and you should carefully review your analysis because
I think get you the wrong result when the i=1 DKIM2-SIgnature header has
an nd= tag present.

I don't think #3.1 contains anything except details of flags that don't
exist any more, and a superficial explanation of what exploded means
(which adds nothing to the material in #15 of spec-07)

#3.2 is not a "modification to DKIM2" it is a proposal for material to
add to the BCP.

I am also entirely unconvinced of the value of auth=spf at all... does
this mean that a Validly Signed DKIM2 Message should be rejected when it
has been forwarded ?  and do you expect later recipients of a message to
re-assess the auth= flags ??

In my view, you should ONLY define auth=dkim2 and you should make clear
that this is ONLY intended to be used by DMARC evaluators who have a
message in their hands which is not a "Validly Signed DKIM2 Message" (or
if they don't understand how to determine that, "a message") and if so
then they should determine that the message has failed to authenticate.

I don't see any other scenarios where any other flag value could
usefully influence a decision.

- -- 
richard @ highwayman . com                       "Nothing seems the same
                          Still you never see the change from day to day
                                And no-one notices the customs slip away"

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