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From: Kai Grossjohann <kai@emptydomain.de>
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Subject: How to thread email using M$ proprietary Thread-Topic and Thread-Index headers?
Date: Tue, 14 Dec 2004 09:57:52 +0100
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I get a lot of email from folks whose emails contain Thread-Topic and
Thread-Index headers.  Thread-Topic contains the subject of the
original message of the thread (ie, sans "Re: " etc), and Thread-Index
appears to contain a hash of some kind.

Does anyone know of a specification for these headers?  (Or a
reverse-engineered description of their meaning?)

Does anyone know how these could be used for threading in Gnus?

Kai