%% You should probably cite rfc5738 instead of this I-D.
@techreport{ietf-eai-imap-utf8-09,
    number =    {draft-ietf-eai-imap-utf8-09},
    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-eai-imap-utf8/09/},
    author =    {Chris Newman and Pete Resnick},
    title =     {{IMAP Support for UTF-8}},
    pagetotal = 15,
    year =      2009,
    month =     nov,
    day =       29,
    abstract =  {This specification extends the Internet Message Access Protocol version 4rev1 (IMAP4rev1) to support UTF-8 encoded international characters in user names, mail addresses, and message headers. This document defines an Experimental Protocol for the Internet community.},
}