%% You should probably cite rfc2449 instead of this I-D.
@techreport{gellens-pop3ext-08,
    number =    {draft-gellens-pop3ext-08},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-gellens-pop3ext/08/},
    author =    {Randall Gellens and Laurence Lundblade and Chris Newman},
    title =     {{POP3 Extension Mechanism}},
    pagetotal = 19,
    year =      1998,
    month =     sep,
    day =       9,
    abstract =  {This memo updates RFC 1939 to define a mechanism to announce support for optional commands, extensions, and unconditional server behavior. {[}STANDARDS-TRACK{]}},
}