Sign in
Version 5.12.0, 2015-02-26
Report a bug

Resolution of The SPF/Sender-ID Experiment

Document type: Replaced Internet-Draft (individual in app area)
Document stream: IETF
Last updated: 2012-04-06 (latest revision 2012-04-04)
Intended RFC status: Informational
Other versions: (expired, archived): plain text, pdf, html

IETF State: (None)
Document shepherd: No shepherd assigned

IESG State: Replaced by draft-ietf-spfbis-experiment
Responsible AD: Pete Resnick
Send notices to:,

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found here:


In 2006 the IETF published a suite of protocol documents comprising SPF and Sender-ID, two proposed email authentication protocols. Because of interoperability concerns created by simultaneous use of the two protocols by a receiver, and some concerns with Sender-ID and compatibility with existing standards, the IESG required them to have Experimental status and invited the community to observe their deployments for a period of time, hoping convergence would be possible later. After six years, sufficient experience and evidence have been collected that the experiment thus created can be considered concluded, and a single protocol can be advanced. This memo presents those findings.


Murray Kucherawy <>

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid)