The "name" parameter

Section 3.2.1 mentions the ``optional "name" parameter to the
Content-Type field''.  Per the MIME spec, the "name" parameter is not
applicable across all content types, it only applied to particular media
types.  The parameter is obsolete, besides.

The SHOULD directive refering to the "name" parameter should be simply
removed from the document.

In "A proper S/MIME implementation MUST use the MIME types and should
not rely on the file extensions." the word "should" should be written as
"must".