On Mon, Dec 30, 2002 at 05:30:15PM +0800, wrote:
> yes,i agree with you that those letters which has no mime-version tag are not well
>formated in mime, but some mail client like outlook express can explain these letters
>very well.
It is stated explicitly in RFC2045:
5.2. Content-Type Defaults
Default RFC 822 messages without a MIME Content-Type header are taken
by this protocol to be plain text in the US-ASCII character set,
which can be explicitly specified as:
Content-type: text/plain; charset=us-ascii
This default is assumed if no Content-Type header field is specified.
...
Plain US-ASCII
text may still be assumed in the absence of a MIME-Version or the
presence of an syntactically invalid Content-Type header field, but
the sender's intent might have been otherwise.
and:
In the absence of a MIME-Version field, a receiving mail user agent
(whether conforming to MIME requirements or not) may optionally
choose to interpret the body of the message according to local
conventions. Many such conventions are currently in use and it
should be noted that in practice non-MIME messages can contain just
about anything.
In other words: if there is no MIME-Version field, you cannot assume
anything about the structure of the message, and you are supposed to
interpret it as plain text.
Who sends out HTML mails without a MIME-Version header anyway? Spammers I
expect, but does any legitimate software do this?
Regards,
Brian.
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