[Standards] Re: Problem with the mailing list

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.