%% You should probably cite draft-ietf-extra-imap-fetch-preview instead of this I-D.
@techreport{ietf-extra-imap-fetch-snippet-00,
    number =    {draft-ietf-extra-imap-fetch-snippet-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-extra-imap-fetch-snippet/00/},
    author =    {Michael Slusarz},
    title =     {{IMAP4 Extension: Message Snippet Generation}},
    pagetotal = 10,
    year =      2018,
    month =     aug,
    day =       3,
    abstract =  {This document specifies an IMAP protocol extension which allows a client to request that a server provide an abbreviated representation of a message (a snippet of text) that can be used by a client to provide a useful contextual preview of the message contents.},
}