> > Shouldn't there be a blank line between the "Subject: " mail
> header line and
> >the first line of the mail body text?
>> Perhaps the SHOULD be - I don't know does the relevant RFC call
> for that.
MUST be a blank line. If not, the additional text is just more (invalid) headers, rather than the body you probably meant it to be. It is valid to have a message with no body, and most MTAs are forgiving enough to basically ignore the invalid headers. Some mail clients will display *everything* in such a message as body text (headers and all), e.g. Mozilla/Thunderbird.
I guess in most of your tests it doesn't matter if there's a body or not. If your SA test was a BODY test, it likely would matter though, as there was no body in your test message.
BTW, From:, To:, Subject: and Date: are required headers, but again most MTAs are forgiving in this regard.
All AFAIK! See RFC 2822 and the older 822.
HTH,
Des
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