The solution seems to be to ensure the mailing list system detects DKIM/DMARC and, if needed, change the sender. If this sounds like an awful hack to you, you'd be right, but it seems to be all we have. I understand the mailing lists might be moving to a different provider soon, so perhaps this gets fixed by the change?
Currently our lists detect and verify dkim/dmarc and re-sign with ARC but it seems some providers are still not reading the ARC headers properly.
I wanted at one point to add a Sender header with re-signed DKIM but mailman3 doesn't support that, preferring to push ARC adoption or else fall back to the full from-header rewriting and enveloping style.
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