> What'd I do wrong? I'm just using Outlook 2003. Is there something
> non-RFC compliant about it?
You are not sending a References or In-Reply-To header as defined
in RFC 2822 section 3.6.4.
And just to make my position on SHOULD vs. MUST clear before
debate starts: MS uses the propietary header "Thread-id" to
convey the same information but in a propietary manner, from
which I conclude there are no valid reasons per RFC 2119 section
3 to ignore the SHOULD.
Jochem
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