> Why won't just changing the subject line start a new thread? Because user mail agents thread on the Message-id:, References:, and In-reply-to: fields in the headers of the messages, but NOT the Subject: line.
For the whole huge, gory, story read the Request For Comments paper by the Internet Engineering Task Force. http://www.faqs.org/rfcs/rfc2822.html Section: 3.6.4. Identification fields I wish more people knew this because the frequency of thread hi-jacks by otherwise well-mannered people is getting out of hand again. It would seem to be a bit of Net-Lore which needs re-iterating from time to time. -- CS
