Apparently, it depends on whether you define "MIME Message" as "Conforms to RFC
2045 (Or whatever... op. cit. ref. "Steeenking Badges"), or "Contains Readable
Mime Data"... I guess if I were *generating* a "Mime Message", I would use the
former definition, whereas if I were trying to *detect* a "Mime Message", I
would use the latter...
I'm not at all sure how I'd define "Bug", in this situation... However, since
(apparently?) the presence of *either* the "Mime-Version" *or* the
"Content-Transfer-Encoding" header will Trigger "mhbuild", shouldn't a
"Content-type" header with "Boundary" flag (or maybe, just a "Content-type" of
"mixed, or "alternative" trigger it likewise? I mean, that header pretty well
guarantees that the message is MIME-formatted, even if it doesn't exactly
conform to the RFC...
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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Thursday, May 9, 2019 10:42 AM, Ken Hornstein <kenh@pobox.com> wrote:
The only mandatory header for "forwarding" (yeah, right) a
pre-existing message is "Content-type", since it has the (pre-generated)
"Boundary" flag... So I just edit everything else out.
This is the problem, here, because that is NOT true.
A MIME message needs a MIME-Version header, full stop, no exceptions;
this is unambiguous (see RFC 2045, §4). This is what we trigger on to
make mhbuild do the right thing. If we don't see a MIME-Version header,
we go on the assumption that the existing draft is NOT a MIME message,
and we MIME-ify the resulting draft, which I suspect ends up generating
a new Content-Type header for your message which does not contain a
boundary marker (because the message isn't a MIME message according to
the rules).
So, I have to say that I don't see this as a nmh bug ... if you want
to feed a MIME message into mhbuild you should include a MIME-Version
header; it's not meaningless at all. If you are trying to send out a
message that does not contain a MIME-Version header, then that is not
valid according to the standards.
--Ken
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