The Message Disposition Notification (MDN) facility defined in RFC
2298 provides a means by which a message can request that message
processing by the recipient be acknowledged as well as a format to be
used for such acknowledgements. However, it doesn't describe how
multiple Mail User Agents (MUAs) should handle the generation of MDNs
in an Internet Message Access Protocol (IMAP4) environment.
This document describes how to handle MDNs in such an environment and
provides guidelines for implementers of IMAP4 that want to add MDN
support to their products.