Strip DKIM headers
Hi lovely sysadmin folks. Periodically we've had Mailman => Gmail bounce issues. Last week this cropped up again with a tor-relays@ post from starlight that got rejected by gmail subscribers (such as Nick and me).
Starlight reached out with this tip I thought I'd pass on...
Presently I think a simple config change will help significantly. If they enable From: "munging" and stripping of DKIM headers it will eliminate hard SPF+DMARC and in-general DKIM message failures and spam scoring. Then messages from the lists will be judged on the reputation of the listserv and standard content-based spam scoring, and not start with a black-mark due to authentication fails. I'm happy to reply to any questions the admin may have.
Feel free to resolve if we shouldn't go this route. I'll point starlight toward this ticket so he can continue the discussion.