@misc{rfc4406,
    series =    {Request for Comments},
    number =    4406,
    howpublished =  {RFC 4406},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC4406},
    url =       {https://www.rfc-editor.org/info/rfc4406},
    author =    {Meng Weng Wong and Jim Lyon},
    title =     {{Sender ID: Authenticating E-Mail}},
    pagetotal = 19,
    year =      2006,
    month =     apr,
    abstract =  {Internet mail suffers from the fact that much unwanted mail is sent using spoofed addresses -- "spoofed" in this case means that the address is used without the permission of the domain owner. This document describes a family of tests by which SMTP servers can determine whether an e-mail address in a received message was used with the permission of the owner of the domain contained in that e-mail address. This memo defines an Experimental Protocol for the Internet community.},
}