@misc{rfc3885,
    series =    {Request for Comments},
    number =    3885,
    howpublished =  {RFC 3885},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC3885},
    url =       {https://www.rfc-editor.org/info/rfc3885},
    author =    {Tony Hansen and Eric P. Allman},
    title =     {{SMTP Service Extension for Message Tracking}},
    pagetotal = 9,
    year =      2004,
    month =     sep,
    abstract =  {This memo defines an extension to the SMTP service whereby a client may mark a message for future tracking. {[}STANDARDS-TRACK{]}},
}