[REBOL] Purpose of [REBOL] at the start of All subject lines sent to list@rebol.com

[Mark . Coleman]

Hi,

        One thing I find bothersome is the [REBOL]'s at the start
        of the headers.

        I use Outlook98 to read email, for many reasons that I
        don't what to debate :-)

        I like to use it's threaded message view(By Conversation Topic),
        but because of the way the subject headers are structured I
        can't.

        Could someone please explain to me why the [REBOL] is at the
        start and the Re:'s are at the end of the subject message?

        I don't want a flame war, just some understanding.

Thanks In Advance...MarkC...