During today's lunch conversation, the question of how we can reasonably scale recipients being able to identify mediators came up.
We've suggested (during M3AAWG sessions) that smaller recipients can build out a whitelist of "commonly seen" mediators, but might there be value in having a mediator publish some sort of DNS record that would indicate that they ARC seal mediated traffic? (We're deeming this not to be a problem for "big" receivers on the basis that they probably already know most of the major mediators within their traffic streams.) This might be an extension to the existing _dmarc record or perhaps a new _arc record type. How would recipients know to look for this record if the mediated traffic doesn't have a "from" in the mediator's domain space? Should they look at domain(s) information in the List- headers? I wanted to get this out to the list for consideration before Thursday's discussion so that we could possibly consider this during the AOB section of the agenda. --Kurt
_______________________________________________ dmarc mailing list dmarc@ietf.org https://www.ietf.org/mailman/listinfo/dmarc
