If I were in charge, I'd retire "all", to be replaced with two new
options with clearer semantics. One would be the "except-mlist" I
proposed a few months back.
I don't understand what verifiers are supposed to do with that. How
is an MTA doing the DKIM verification and filtering supposed know
what's a mailing list and what's not? If I were a bad guy, I'd put
fake headers on my spam to make it look like a list mail.
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