Emacs "Gnus" has a per-group setting (a per-folder setting) called
"broken-reply-to".  When it is set to true, the Reply button works
slightly differently.  It is meant for use with mailing lists that set
the "Reply-To" header back to the mailing list, so that Reply goes to
the list rather than to the individual who wrote the message.  That is
broken behavior; when I want to reply to the list I'll use
"Reply-to-list".  But many mailing lists will set up that way to
accomadate people with lazy email software.

I would also like the ability to call on "reply to list" either from
the toolbar or from a keyboard command.  (maybe it already does that
but I just have not discovered it yet?)