"The multipart eport Multipurpose Internet Mail Extensions (MIME) media type is a general ""family"" or ""container"" type for electronic mail reports of any kind. Although this memo defines only the use of the multipart eport media type with respect to delivery status reports@ mail processing programs will benefit if a single media type is used for all kinds of reports. This memo obsoletes ""The Multipart/Report Content Type for the Reporting of Mail System Administrative Messages""@ RFC 3462@ and marks RFC 3462 and its predecessor as ""Historic""."
RFC 6522-2012 history
2012RFC 6522-2012 The Multipart/Report Media Type for the Reporting of Mail System Administrative Messages