%% You should probably cite rfc6686 instead of this I-D.
@techreport{ietf-spfbis-experiment-05,
    number =    {draft-ietf-spfbis-experiment-05},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-spfbis-experiment/05/},
    author =    {Murray Kucherawy},
    title =     {{Resolution of The SPF/Sender-ID Experiment}},
    pagetotal = 11,
    year =      2012,
    month =     apr,
    day =       20,
    abstract =  {In 2006 the IETF published a suite of protocol documents comprising SPF and Sender-ID, two proposed email authentication protocols. Because of possible interoperability issues, particularly but not only those created by simultaneous use of the two protocols by a receiver, the IESG was unable to determine technical consensus and decided it was best to publish all of RFC4405, RFC4406, RFC4407 and RFC4408 as Experimental documents. The IESG invited the community to observe their deployments for a period of time, and expressed hope for later convergence of opinion. 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 document presents those findings.},
}