Perhaps they are, but there could be some value in trying to define a set of
reversible list modifications which would permit DKIM signatures to still be
useful. That's not to mandate those modifications, or to forbid others, but
as guidance. It could be a way forward.
Sounds like another job for ASRG. First you'd need to see if you could
characterize a meaningful set of lists, not just the ones you and I happen
to be subscribed to.
R's,
John
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