I watched the wrap up session and see ARC can workaround the issue with listserv and forwards.
What are folks doing about inbound listservs and dmarc? We watch for inbound dmarc rejects and find many listserv messages fail. Are you piecemeal permitting onesie twosie inbound although they fail dmarc as you encounter them?
dkim=pass header.s=pdx header.d=collegenet.com;
dkim=fail header.s=selector2 header.d=coastal.edu;