Dear WG, A draft has been posted offering two alternatives not requiring cooperation of disruptive ESPs.
Basic unilateral escape methods include use of a From replacement header IM-From:. This header can include the tag normally added to the Subject line as the display name in the Group syntax. It also includes a placeholder for resource connection used in a "live" discussions, hence the use of IM. This header is free to carry the author role since it will not be excluded by DMARC policy. The other unilateral mode is to defined a DMARC fallback policy 'p' for public user accounts. This mode permits acceptance based on the Sender header field alignment with assumed MUA displaying the identity sourcing the message. It also attempts to remove concerns related to adoption of TPA-Label from the perspective of large providers by allowing DMARC policy to indicate a consolidated tpa-label zone rather than being directly accessed from the customer's zone. This avoids use of DNAME or zone delegations. While TPA-Label may appear to contain too much information, all of it is optional. The goal behind providing a structure for additional third-party information is to allow anticipated limitations be imposed on the scope of authorization granted. This scope also selectively permits other authentication methods be accepted beyond just DKIM or SPF. It is able to indicate the message must be DKIM signed AND must contain a specific LIST-ID header, for example. This ensures recipients in this domain can depend on safer sorting of disparate messages sources from the same domain. http://tools.ietf.org/html/draft-otis-dmarc-escape-00 Regards, Douglas Otis _______________________________________________ dmarc mailing list [email protected] https://www.ietf.org/mailman/listinfo/dmarc
