Jinx wrote:

> I can easily sort them into threads either way by Subject

If you think about it, there's really no way you can display a thread
correctly based on subject /alone/. This only would give you the "flat"
display some message boards have, ordered by date/time. So whenever you
"thread by subject" and get a multi-level thread view, your reader does
something behind the scenes that's based on more than just the subject.

Most email readers are designed to do some heuristic guessing, based on the
fact that many email users don't use their email program in a way (or don't
use an email program that can be used in a way) that the references and/or
in-reply-to headers are correct. So they use all available indications to
generate threading, including the mentioned headers and the subject. Which
should be configurable, because sometimes you may want the subject to be
included in the heuristics, and sometimes you may not want that.

And of course, the threads as displayed by different email readers will
vary, depending on the heuristics used by the individual readers.

Gerhard
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