Ohta-san,
my bad language.
The intent was to say:
The sender cannot assume that anything outside the US-ASCII
character set will be understood by *all* MIME readers.
I know for a fact that this statement is true.
Sure. At the same time,
The sender cannot assume that anything outside the US-ASCII
character set will be understood by *all* non-MIME readers.
Moreover, in Sweden and in Japan, at least,
The MIME/non-MIME sender cannot assume that anything outside
the ISO 646 character set will be understood by *all*
MIME/non-MIME readers.
because MIME MUA users are, sometimes, using a NON-ASCII ISO 646
termnials with termcap=vt100. That's the fact.
and through EBCDIC world,
The MIME/non-MIME sender cannot assume that anything outside the
EBCDIC safe part of ISO 646 character set will be understood
by *all* MIME/non-MIME readers.
So, the issues are totally unrelated to MIME.
Masataka Ohta