Email Authentication

The DKIM Working Group are developing a spiritual successor to DKIM. They have named it DKIM2 but it is more of its own thing than an iterative new version of the original DKIM protocol. As of now (June 2026) it is still going through the drafting process so there is no RFC or stable specification to develop against. Ideas are still being stress tested and edge cases considered. The latest Internet-Draft can be viewed here and there is also an explanatory website operated by the WG here. ...

The original DMARC specification was published back in March 2015 as RFC 7489 and had a status of “Informational”. A new revision published in May 2026 breaks the specification into multiple RFCs and has a status of “Proposed standard”. This is the first step to becoming an Internet Standard. The new DMARC RFCs: RFC 9989 - core protocol specification RFC 9990 - aggregate reporting specification RFC 9991 - failure reporting specification In the approximately ten years between these two revisions the specification has been refined but not radically altered. The updated specification is fully backward compatible with the previous one. ...