Alex Harford wrote: > No, because your mail client preserves some information that you > probably don't see, that other mail clients (GMail, Mutt, etc) use as > hints for threading... this way you can track threads even if the > subject lines change. FWIW: These are the offending(?) header lines: Original message: Message-ID: Follow up: In-Reply-To: If these headers (and others like them) are used properly it makes it easy to track when a thread splits for some reason or some wiseacre decides to randomly change the subject line when replying to the same thread/etc. (NOT trying to start a new thread, just changing the subject). It also allows for proper nesting so you can see at a glance which message the response was aimed at. I suppose threading based solely on subject line sort of "works" depending on your idea of threading, but it does severely limit the functionality. Example: Message-ID: <1234567@example.com> From: complainer@example.com Subject: Stop the insanity [...] Could you guys stop hitting reply-to to start a new thread and ruining the threading on existing ones? Please? Pretty please with sugar on top? [EOM] Message-ID: <987654321@example.com> From: no-way@example.com In-Reply-To: <1234567@example.com> Subject: LOL, NO WAY YOU LOOSER! HAH, HAH [nt] [EOM] Message-ID: <76587575@example.com> From: myMailerThreadsOnSubject@example.com In-Reply-To: <987654321@example.com> Subject: LOL, NO WAY YOU LOOSER! HAH, HAH [nt] What? Who are you replying to? Huh? *plonk* [EOM] References for the curious (terminally bored?): http://www.faqs.org/rfcs/rfc2076.html http://www.faqs.org/rfcs/rfc822.html Tad -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist