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?
There's always the option of using RSS to pull messages from a list,
and avoiding the list->subscriber mail link altogether. Many MUAs
make an RSS feed look just like mail from a list. (Responses to this
part to ASRG, please, since it's unrelated to DKIM.)
R's,
John
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