The stuff inside message/pem-clear and application/pem-encrypted is intended
to be a complete MIME object, with a content-type header and so on. If this
isn't clear the document needs to be changed so that it is. (Wording
recommendations are welcome!)
I think the confusion arises, to me at least, because of the following.
It is stated in the discussion of preparing a msg. for submission that
PEM enhancements can be applied to a MIME body part.
However, in the description of message/pem-clear and application/pem-encrypted,
it is not stated that the body part of these C-Ts is itself a MIME body part
with the appropriate PEM enhancements applied to the entire body part.
Also, you said something in your last msg. which confuses me. Why will
a gateways change of the CTE possibly lead to a MIC verification error?
(Assuming that something like quoted printable or base64 is used.)
-Ray