I'm trying to track down info on the following mail headers - who may
have defined them, how widely used they are, stuff like that.  The
headers are:

Thread-Topic:
Thread-Index:
In-Reply-To:

Anyone have any suggestions or knowledge?  My attempt at googling was
not useful - I couldn't come up with a search criteria that didn't
yield a million false positives.

-- 
Scott Raun
sraun at fireopal.org

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