It seems to me that message/rfc822 would be adequate, since that was
defined partly (RFC-1341, page 37) for this purpose.
7.3 The Message Content-Type
It is frequently desirable, in sending mail, to encapsulate
another mail message. For this common operation, a special
Content-Type, "message", is defined. The primary subtype,
message/rfc822, has no required parameters in the Content-
Type field. Additional subtypes, "partial" and "External-
body", do have required parameters. These subtypes are
explained below.
Excellent idea, even if it is already present.
Should we add a suggestion to MIME/2 that a single message
that has MIME-version: in its first lines of body, and no MIME header,
may actually be a stripped message/rfc822, and ask it to behave
accordingly? This is icky, but not a major change to MIME....
Harald Tveit Alvestrand