%% You should probably cite rfc8314 instead of this I-D.
@techreport{ietf-uta-email-deep-12,
    number =    {draft-ietf-uta-email-deep-12},
    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/12/},
    author =    {Keith Moore and Chris Newman},
    title =     {{Cleartext Considered Obsolete: Use of Transport Layer Security (TLS) for Email Submission and Access}},
    pagetotal = 26,
    year =      2017,
    month =     dec,
    day =       6,
    abstract =  {This specification outlines current recommendations for the use of Transport Layer Security (TLS) to provide confidentiality of email traffic between a Mail User Agent (MUA) and a Mail Submission Server or Mail Access Server. This document updates RFCs 1939, 2595, 3501, 5068, 6186, and 6409.},
}