Sender Policy Framework for Authorizing Use of Domains in Email, Version 1
RFC 7208, “Sender Policy Framework for Authorizing Use of Domains in Email, Version 1”, is a Proposed Standard document published in April 2014 by S. Kitterman. It obsoletes RFC 4408. It has since been updated by RFC 7372, RFC 8553, RFC 8616. The canonical text is published by the RFC Editor.
Abstract
Email on the Internet can be forged in a number of ways. In particular, existing protocols place no restriction on what a sending host can use as the "MAIL FROM" of a message or the domain given on the SMTP HELO/EHLO commands. This document describes version 1 of the Sender Policy Framework (SPF) protocol, whereby ADministrative Management Domains (ADMDs) can explicitly authorize the hosts that are allowed to use their domain names, and a receiving host can check such authorization.
This document obsoletes RFC 4408.
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 7208 is hosted at rfc-editor.org. Available in TXT,HTML.
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