RFC 1855 Deals with other issues similar to this. It is a good read for
any denizen of the eentarweb.

http://www.dtcc.edu/cs/rfc1855.html

Jonas H wrote:
> My mail client (Mozilla Thunderbird) and countless others display mail
> conversations as trees, with replies listed below the mail they are
> replies to in some way, such that the flow of the conversation is
> visually apparent, and mails that relate to each other are grouped
> together. This is a great help when dealing with a large-ish amount of
> mails in a mailing list like this.
>
> This requires, however, that replies are marked as such, and this is
> where the blessing becomes a curse. For some reason (and I'm not blaming
> anyone here, there might be a million reasonable explanations), many
> users on this list use the "reply" button very liberally, which results
> in threads that jump from topic to topic, because unrelated mails are
> marked as replies to each other (One such example is the "HTML manuals
> available" thread, which by no contains no less than 5 different,
> unrelated topics of conversation).
>
> So if you want to start a new topic, use the "New mail" button, or
> "Write" or whatever it's called in your mail client of choice. If you
> want to reply to a mail, please use the reply button.
>
> This way, I (and probably others) get to retain my sanity.
>

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