>an IETF draft, these lists were changed to not modify the message body >or subject line in any way (no footers and no subject tags). That's one of the workarounds discussed in the wiki here: http://wiki.asrg.sp.am/wiki/Mitigating_DMARC_damage_to_third_party_mail Any change to existing practice will have some bad effects. If a list has been adding subject tags, and it stops adding them, people who sort on subject tags will lose. If it rewrites the From: line to put in the list address, people who pick messages to read based on who wrote them will lose, and it breaks S/MIME signatures. And so forth. See wiki for details. Short of some DKIM-bis that allows for trusted forwarders to sign messages in a way that DMARC recipients will accept (which we're working on but don't hold your breath) there's no good solution to this, only less bad solutions. R's, John