@misc{rfc4405,
    series =    {Request for Comments},
    number =    4405,
    howpublished =  {RFC 4405},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC4405},
    url =       {https://www.rfc-editor.org/info/rfc4405},
    author =    {Harry Katz and Eric P. Allman},
    title =     {{SMTP Service Extension for Indicating the Responsible Submitter of an E-Mail Message}},
    pagetotal = 14,
    year =      2006,
    month =     apr,
    abstract =  {This memo defines an extension to the Simple Mail Transfer Protocol (SMTP) service that allows an SMTP client to specify the responsible submitter of an e-mail message. The responsible submitter is the e-mail address of the entity most recently responsible for introducing a message into the transport stream. This extension helps receiving e-mail servers efficiently determine whether the SMTP client is authorized to transmit mail on behalf of the responsible submitter's domain. This memo defines an Experimental Protocol for the Internet community.},
}