%% You should probably cite rfc5232 instead of this I-D.
@techreport{ietf-sieve-imapflags-05,
    number =    {draft-ietf-sieve-imapflags-05},
    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-sieve-imapflags/05/},
    author =    {Alexey Melnikov},
    title =     {{Sieve Email Filtering: Imap4flags Extension}},
    pagetotal = 12,
    year =      2006,
    month =     may,
    day =       12,
    abstract =  {Recent discussions have shown that it is desirable to set different IMAP (RFC 3501) flags on message delivery. This can be done, for example, by a Sieve interpreter that works as a part of a Mail Delivery Agent. This document describes an extension to the Sieve mail filtering language for setting IMAP flags. The extension allows setting of both IMAP system flags and IMAP keywords. {[}STANDARDS-TRACK{]}},
}