%% You should probably cite rfc7817 instead of this I-D.
@techreport{ietf-uta-email-tls-certs-08,
    number =    {draft-ietf-uta-email-tls-certs-08},
    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-tls-certs/08/},
    author =    {Alexey Melnikov},
    title =     {{Updated TLS Server Identity Check Procedure for Email Related Protocols}},
    pagetotal = 12,
    year =      2015,
    month =     dec,
    day =       17,
    abstract =  {This document describes TLS server identity verification procedure for SMTP Submission, IMAP, POP and ManageSieve clients. It replaces Section 2.4 of RFC 2595, updates Section 4.1 of RFC 3207, updates Section 11.1 of RFC 3501, updates Section 2.2.1 of RFC 5804.},
}