[Nmh-workers] Non-ASCII Characters in bodies and subjects

[norm]

If I store a draft in UTF-8 format, with non-ASCII characters in its body,
then, upon sending, a header, 'Content-Transfer-Encoding' is added and the
header, Content-Type, is modified.

But there is no such modification, when the draft's body is all ASCII, but
it's Subject contains non-ASCII characters.

Is there an unenforced rule that all headers must be all ASCII, when a draft
is stored in UTF-8 format? Or perhaps the defacto standards allow such
headers?

    Norman Shapiro