A New Internet-Draft is available from the on-line Internet-Drafts directories.
Abstract: “Efforts to design an internationalization model for electronic mail frequently encounter situations in which an internationalized message — perhaps one containing some headers with characters coded in UTF-8 — must be converted and transported over a traditional, 7-bit infrastructure. This document provides a specification, building on the design of message/rfc822, for encapsulating messages with internationalized headers and/or body part content types.”
“This specification is one of a group intended to provide a modified and extended email environment for fully internationalized email. If approved, it is expected to update the discussion of “message/” content types in RFC 2046.”
http://www.ietf.org/internet-drafts/draft-klensin-email-i18n-message-00.txt