%% You should probably cite rfc5183 instead of this I-D.
@techreport{freed-sieve-environment-05,
    number =    {draft-freed-sieve-environment-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-freed-sieve-environment/05/},
    author =    {Ned Freed},
    title =     {{Sieve Email Filtering: Environment Extension}},
    pagetotal = 10,
    year =      2008,
    month =     mar,
    day =       28,
    abstract =  {This document describes the "environment" extension to the Sieve email filtering language. The "environment" extension gives a Sieve script access to information about the Sieve interpreter itself, where it is running, and about any transport connection currently involved in transferring the message. {[}STANDARDS-TRACK{]}},
}