Any answer I give to that would be speculation. How about this: If MUAs
evolve as a result of all of this, I would hope it's in a direction that
doesn't just create whack-a-mole for the problem DMARC is trying to solve.
That suggests it would be in the DMARC cartel's interest to avoid putting
evolutionary pressure on MUAs to do things they won't like. See you in
ietf-822.
Regards,
John Levine, johnl(_at_)taugh(_dot_)com, Taughannock Networks, Trumansburg NY
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