Sender Policy Framework (SPF) for Authorizing Use of Domains in E-Mail, Version 1, April 2006
- Canonical URL:
- File formats:
- Obsoleted by:
- RFC 7208
- Updated by:
- RFC 6652
- M. Wong
- NON WORKING GROUP
Discuss this RFC: Send questions or comments to firstname.lastname@example.org
E-mail 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 reverse-path of a message or the domain given on the SMTP HELO/EHLO commands. This document describes version 1 of the ender Policy Framework (SPF) protocol, whereby a domain may explicitly authorize the hosts that are allowed to use its domain name, and a receiving host may check such authorization. This memo defines an Experimental Protocol for the Internet community.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 4844.