It is much more difficult to follow a conversation via a mailing list, as
opposed to news. I don't know of any user agent which let you organize threads
based on the 'In-Reply-To' headers the way a newsreader threads articles via
the Reference line.
But even if you feed a local newsgroups and manage to thread articles, you
still loose the flexibility of a normal newsgroups where a single article can
raise a huge tree of replies.
(I've been careful enough in this reply to avoid any quotations, leaving only
the 'In-Reply-To' header field. Just to strengthen my point :-)
I think it would be possible for a mailing list "dispatcher" to build up a
"Reference" line based on the Message-ID and the In-Reply-To fields, so that
people who do feed a newsgroup still have the possibility of thread reading
(and/or trashing whenever appropriate). Such a Reference header would not
be of any inconvenience otherwise, since most user agent give the possibility
to weed out unwanted headers.
Raphael Manfredi <email@example.com>
Interactive Software Engineering Inc.
270 Storke Road, Suite #7 / Tel +1 (805) 685-1006 \
Goleta, California 93117, USA \ Fax +1 (805) 685-6869 /