%% You should probably cite rfc6758 instead of this I-D.
@techreport{melnikov-smtp-priority-tunneling-04,
    number =    {draft-melnikov-smtp-priority-tunneling-04},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-melnikov-smtp-priority-tunneling/04/},
    author =    {Alexey Melnikov and Ken Carlberg},
    title =     {{Tunneling of SMTP Message Transfer Priorities}},
    pagetotal = 11,
    year =      2012,
    month =     jul,
    day =       31,
    abstract =  {This memo defines a mechanism for tunneling of SMTP (Simple Mail Transfer Protocol) Message Transfer Priority values through MTAs (Message Transfer Agents) that don't support the MT-PRIORITY SMTP extension. This document is not an Internet Standards Track specification; it is published for informational purposes.},
}