@misc{rfc5518,
    series =    {Request for Comments},
    number =    5518,
    howpublished =  {RFC 5518},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC5518},
    url =       {https://www.rfc-editor.org/info/rfc5518},
    author =    {Arvel Hathcock and John R. Levine and Paul E. Hoffman},
    title =     {{Vouch By Reference}},
    pagetotal = 12,
    year =      2009,
    month =     apr,
    abstract =  {This document describes the Vouch By Reference (VBR) protocol. VBR is a protocol for adding third-party certification to email. It permits independent third parties to certify the owner of a domain name that is associated with received mail. {[}STANDARDS-TRACK{]}},
}