Anything that requires mailing list software to change won't work. If mailing list software is changed, the right answer is for the mailing list to re-sign the message. That doesn't help the DMARC situation now, but DMARC could be given other options once that happens.
That's right. But maybe there could be a multipart/dkim type that lets several signatures exist in a message - all of which could potentially verify with different d=. Then the list only needs to sign what it adds to the end somehow and it leaves the rest of the message alone. Seems like we went over this way back years ago but I'm old now :)
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