@techreport{martin-smtp-ipv6-to-ipv4-fallback-01,
    number =    {draft-martin-smtp-ipv6-to-ipv4-fallback-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-martin-smtp-ipv6-to-ipv4-fallback/01/},
    author =    {Franck Martin and Alec Peterson},
    title =     {{SMTP IPv6 to IPv4 Fallback: An Applicability Statement}},
    pagetotal = 10,
    year =      2014,
    month =     may,
    day =       15,
    abstract =  {This Applicability Statement describes how Mail Transfer Agents (MTAs) can be encouraged to fall back to IPv4 when a message is refused over IPv6.},
}