In article <m1cJIF7-0000DEC@xxxxxxxxxxxxxxxxxxxx> you write: >Just a random idea, I don't think I have seen it before, but I may have missed >it. > >What about adding a checkbox in the mailman profile for subscribers of the >lists that basically says: if you detect that the sender is using DMARC then >please rewrite the From header. Whether a mail system enforces DMARC policies is up to the system's manager, not individual users. Even in the IETF, I expect that many, perhaps a majority, of users have only the dimmest idea what if anything their operator does with DMARC. R's, John