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RFC 6686
Resolution of the Sender Policy Framework (SPF) and Sender ID Experiments,July 2012
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DOI: https://doi.org/10.17487/RFC6686
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Abstract
In 2006, the IETF published a suite of protocol documents comprisingthe Sender Policy Framework (SPF) and Sender ID: two proposed emailauthentication protocols. Both of these protocols enable one topublish, via the Domain Name System, a policy declaring which mailservers were authorized to send email on behalf of the domain namebeing queried. There was concern that the two would conflict in somesignificant operational situations, interfering with messagedelivery.
The IESG required all of these documents (RFC 4405, RFC 4406, RFC4407, and RFC 4408) to be published as Experimental RFCs andrequested that the community observe deployment and operation of theprotocols over a period of two years from the date of publication todetermine a reasonable path forward.
After six years, sufficient experience and evidence have beencollected that the experiments thus created can be consideredconcluded. This document presents those findings. This document is not an Internet Standards Track specification; it ispublished for informational purposes.
For the definition ofStatus,seeRFC 2026.
For the definition ofStream, seeRFC 8729.