--On Tuesday, November 09, 2004 5:52 PM -0500 "Charles R. Anderson"
<cra(a)WPI.EDU> wrote:
Don't "Reply" to a subject that is unrelated to your
question. That
causes the "In-Reply-To" header to refer to the old thread, causing
threaded mail readers to display your new subject as part of the old
thread. Instead, compose a new e-mail to start a new topic.
Also note the References: header, which lists all earlier messages in the
thread. This can be used if the replied-to message isn't available, so that
the message can still be linked into the thread.