@misc{rfc5463,
    series =    {Request for Comments},
    number =    5463,
    howpublished =  {RFC 5463},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC5463},
    url =       {https://www.rfc-editor.org/info/rfc5463},
    author =    {Ned Freed},
    title =     {{Sieve Email Filtering:  Ihave Extension}},
    pagetotal = 6,
    year =      2009,
    month =     mar,
    abstract =  {This document describes the "ihave" extension to the Sieve email filtering language. The "ihave" extension provides a means to write scripts that can take advantage of optional Sieve features but can still run when those optional features are not available. The extension also defines a new error control command intended to be used to report situations where no combination of available extensions satisfies the needs of the script. {[}STANDARDS-TRACK{]}},
}