%% You should probably cite rfc9219 instead of this I-D.
@techreport{ietf-jmap-smime-00,
    number =    {draft-ietf-jmap-smime-00},
    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-jmap-smime/00/},
    author =    {Alexey Melnikov},
    title =     {{Extensions to JMAP for S/MIME signature verification}},
    pagetotal = 5,
    year =      2019,
    month =     jul,
    day =       8,
    abstract =  {This document specifies extension to JMAP for returning S/MIME signature verification status.},
}