@misc{rfc1653,
    series =    {Request for Comments},
    number =    1653,
    howpublished =  {RFC 1653},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC1653},
    url =       {https://www.rfc-editor.org/info/rfc1653},
    author =    {Ned Freed and Dr. John C. Klensin and Keith Moore},
    title =     {{SMTP Service Extension for Message Size Declaration}},
    pagetotal = 8,
    year =      1994,
    month =     jul,
    abstract =  {This memo defines an extension to the SMTP service whereby an SMTP client and server may interact to give the server an opportunity to decline to accept a message (perhaps temporarily) based on the client's estimate of the message size. {[}STANDARDS-TRACK{]}},
}