@misc{rfc1893,
    series =    {Request for Comments},
    number =    1893,
    howpublished =  {RFC 1893},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC1893},
    url =       {https://www.rfc-editor.org/info/rfc1893},
    author =    {Gregory Vaudreuil},
    title =     {{Enhanced Mail System Status Codes}},
    pagetotal = 15,
    year =      1996,
    month =     jan,
    abstract =  {There currently is not a standard mechanism for the reporting of mail system errors except for the limited set offered by SMTP and the system specific text descriptions sent in mail messages. There is a pressing need for a rich machine readable status code for use in delivery status notifications {[}DSN{]}. This document proposes a new set of status codes for this purpose. {[}STANDARDS-TRACK{]}},
}