DMARC

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. ...

2024 Update: Gmail and Yahoo! Change Their Sending Requirements Last updated: 10 August 2024 Refer to Chapter 8 (Sender Reputation) and Chapter 11 (Email Authentication) of Email Deliverability Explained (2nd edition) for background information on topics discussed in this post. Back in October 2023 Google and Yahoo! simultaneously announced that they would begin enforcing new requirements for bulk senders from February 2024 onwards. By June 2024 all of the new requirements are officially being enforced. ...