%% You should probably cite draft-ietf-extra-imap-status-size instead of this I-D.
@techreport{bosch-imap-status-size-00,
    number =    {draft-bosch-imap-status-size-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-bosch-imap-status-size/00/},
    author =    {Stephan Bosch},
    title =     {{Internet Message Access Protocol (IMAP) - STATUS=SIZE Extension}},
    pagetotal = 5,
    year =      2017,
    month =     sep,
    day =       15,
    abstract =  {This document adds a new capability called "STATUS=SIZE" to the Internet Message Access Protocol (IMAP). It allows retrieving the total storage size of a mailbox with a single STATUS command rather than retrieving and summing the sizes of all individual messages in that mailbox.},
}