@misc{rfc3656,
    series =    {Request for Comments},
    number =    3656,
    howpublished =  {RFC 3656},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC3656},
    url =       {https://www.rfc-editor.org/info/rfc3656},
    author =    {Rob Siemborski},
    title =     {{The Mailbox Update (MUPDATE) Distributed Mailbox Database Protocol}},
    pagetotal = 19,
    year =      2003,
    month =     dec,
    abstract =  {As the demand for high-performance mail delivery agents increases, it becomes apparent that single-machine solutions are inadequate to the task, both because of capacity limits and that the failure of the single machine means a loss of mail delivery for all users. It is preferable to allow many machines to share the responsibility of mail delivery. The Mailbox Update (MUPDATE) protocol allows a group of Internet Message Access Protocol (IMAP) or Post Office Protocol - Version 3 (POP3) servers to function with a unified mailbox namespace. This document is intended to serve as a reference guide to that protocol.},
}