mail threading (reply & new mail)

Hi, I'd like to ask for not using "reply" (in the mail client) when a new thread is being opened. Using the "reply" function and changing the "Subject:" is quite OK (sometimes even recommended), but I've noticed some people do it instead of sending a new mail. Mail threading clients (e.g. Emacs Gnus) keep these messages in the old thread. It makes a quick navigation a bit difficult. -- Alexandr.Malusek@imv.liu.se