%% You should probably cite rfc5173 instead of this I-D.
@techreport{ietf-sieve-body-09,
    number =    {draft-ietf-sieve-body-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-sieve-body/09/},
    author =    {Jutta Degener and Philip Guenther},
    title =     {{Sieve Email Filtering: Body Extension}},
    pagetotal = 10,
    year =      2008,
    month =     mar,
    day =       20,
    abstract =  {This document defines a new command for the "Sieve" email filtering language that tests for the occurrence of one or more strings in the body of an email message. {[}STANDARDS-TRACK{]}},
}