%% You should probably cite rfc8621 instead of this I-D.
@techreport{ietf-jmap-mail-04,
    number =    {draft-ietf-jmap-mail-04},
    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-mail/04/},
    author =    {Neil Jenkins},
    title =     {{JMAP for Mail}},
    pagetotal = 55,
    year =      2018,
    month =     mar,
    day =       5,
    abstract =  {This document specifies a data model for synchronising email data with a server using JMAP.},
}