RFC 3459 (rfc3459) - Page 1 of 24


Critical Content Multi-purpose Internet Mail Extensions (MIME) Parameter



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Network Working Group                                          E. Burger
Request for Comments: 3459                            SnowShore Networks
Updates: 3204                                               January 2003
Category: Standards Track


              Critical Content Multi-purpose Internet Mail
                      Extensions (MIME) Parameter

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

Abstract

   This document describes the use of a mechanism for identifying body
   parts that a sender deems critical in a multi-part Internet mail
   message.  The mechanism described is a parameter to Content-
   Disposition, as described by RFC 3204.

   By knowing what parts of a message the sender deems critical, a
   content gateway can intelligently handle multi-part messages when
   providing gateway services to systems of lesser capability.  Critical
   content can help a content gateway to decide what parts to forward.
   It can indicate how hard a gateway should try to deliver a body part.
   It can help the gateway to pick body parts that are safe to silently
   delete when a system of lesser capability receives a message.  In
   addition, critical content can help the gateway chose the
   notification strategy for the receiving system.  Likewise, if the
   sender expects the destination to do some processing on a body part,
   critical content allows the sender to mark body parts that the
   receiver must process.











Burger                      Standards Track


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