On Wed, Oct 19, 2011 at 05:47:10PM -0700, Rich Alderson wrote:
[Should have changed Subject: header that sooner, but
it will screw
threading at this point. --rma]
The two mail clients I use take advantage of the "References:" and
"In-Reply-To:" headers. (Possibly also "Thread-topic:" and
"Thread-index:" which seems to be Microsofts "standard").
This means that changing the topic doesn't matter much for threading
which is both good an bad. It's good when you want to see where
discussion orginated from to get som background. But it is bad when
someone uses "Reply" to create an entirely different discussion.
I urge anyone to not use "Reply" unless you intend the mail to be sorted
under some unrelated thread for a subset of readers (e.g. Me).
Cheers,
Pontus.