On Sun, Jul 20, 2014 at 09:26:45AM -0400, Michael Richardson wrote: > > Regardless of how/if/why/when we process DMARC as a specification, we need to > decide how ietf.org MTA is going to deal with things. For what it is worth the postfix-users and postfix-devel mailing lists don't have any DMARC issues. Long before DMARC, when DKIM was still 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). Rather, the lists only append "List-foo" headers, add a "Sender:" header and otherwise forward the original message unmodified with a new envelope. The result is that the author DKIM signature remains valid if present. -- Viktor.