Resolution of The SPF/Sender-ID Experiment

Document Type Replaced Internet-Draft (individual in app area)
Author Murray Kucherawy 
Last updated 2015-10-14 (latest revision 2012-04-04)
Replaced by RFC 6686
Stream Internet Engineering Task Force (IETF)
Intended RFC status Informational
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state (None)
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-spfbis-experiment
Action Holders
Consensus Boilerplate Unknown
Telechat date
Responsible AD Pete Resnick
Send notices to (None)

This Internet-Draft is no longer active.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


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.)