@misc{rfc7208,
    series =    {Request for Comments},
    number =    7208,
    howpublished =  {RFC 7208},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC7208},
    url =       {https://www.rfc-editor.org/info/rfc7208},
    author =    {Scott Kitterman},
    title =     {{Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1}},
    pagetotal = 64,
    year =      2014,
    month =     apr,
    abstract =  {Email on the Internet can be forged in a number of ways. In particular, existing protocols place no restriction on what a sending host can use as the "MAIL FROM" of a message or the domain given on the SMTP HELO/EHLO commands. This document describes version 1 of the Sender Policy Framework (SPF) protocol, whereby ADministrative Management Domains (ADMDs) can explicitly authorize the hosts that are allowed to use their domain names, and a receiving host can check such authorization. This document obsoletes RFC 4408.},
}