John Levine wrote:
Is there some long-standing toxic effect of mailing lists other than
that they don't fit the simple identity models used by recently
devised authentication schemes?
The opt-in mechanism, I'd say. There's no standardized way for
subscribers' servers to learn about subscriptions.
Even if you consider that to be a problem, what could it possibly have
to do with DKIM?
Just that if there were a handshake between a list server and a new
subscriber's MX, they could also agree upon ADSP forwarding, e.g. by
whitelisting the list server.
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