%% You should probably cite rfc8314 instead of this I-D.
@techreport{ietf-uta-email-deep-06,
    number =    {draft-ietf-uta-email-deep-06},
    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-uta-email-deep/06/},
    author =    {Keith Moore and Chris Newman},
    title =     {{Mail User Agent Strict Transport Security (MUA-STS)}},
    pagetotal = 42,
    year =      2017,
    month =     mar,
    day =       13,
    abstract =  {This specification defines a set of requirements and facilities designed to improve email confidentiality between a mail user agent (MUA) and a mail submission or mail access server. This provides mechanisms intended to increase use of already deployed Transport Layer Security (TLS) technology and provides a model for a mail user agent's confidentiality assurance. This enables mail service providers to advertise strict transport security (STS) policies that request MUAs increase confidentiality assurance.},
}