Message Header Field for Indicating Message Authentication Status
RFC 5451, “Message Header Field for Indicating Message Authentication Status”, is a Proposed Standard document published in April 2009 by M. Kucherawy. It has since been updated by RFC 6577. It has been obsoleted by RFC 7001 — refer to the newer document for the authoritative version. The canonical text is published by the RFC Editor.
Abstract
This memo defines a new header field for use with electronic mail messages to indicate the results of message authentication efforts. Any receiver-side software, such as mail filters or Mail User Agents (MUAs), may use this message header field to relay that information in a convenient way to users or to make sorting and filtering decisions. [STANDARDS-TRACK]
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 5451 is hosted at rfc-editor.org. Available in TXT,HTML.
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