Headers munged from strict DKIM/DMARC (yahoo.com) in following form: From: Michael Paoli via BALUG-test3 balug-test3@lists.balug.org Reply-To: Michael Paoli <[localpart]@yahoo.com> With Mailman 3 options: DMARC mitigation action: Wrap the message in an outer message From: the list. DMARC Mitigate unconditionally: No DMARC rejection notice: DMARC wrapped message text:

And this message sent from logged in session on hyperkitty interface