Domain-Based Message Authentication, Reporting, and Conformance Failure Reporting
RFC 9991, “Domain-Based Message Authentication, Reporting, and Conformance Failure Reporting”, is a Proposed Standard document published in May 2026 by S. Jones, A. Vesely. It updates RFC 6591. It obsoletes RFC 7489. The canonical text is published by the RFC Editor.
Abstract
Domain-based Message Authentication, Reporting, and Conformance (DMARC) is a mechanism by which a Domain Owner can request feedback about email messages using their domain in the From: address field. This document describes "failure reports", or "failed message reports", which provide details about individual messages that failed to authenticate according to the DMARC mechanism.
This document updates RFC 6591 and obsoletes RFC 7489.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 9991 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
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