Is there a reason that the reply-to header is not set for the mailing
list? This is the only mailing list I have ever participated in
which does not have this header set and it results in replies being
sent to individuals instead of the list quite regularly. In a list
like this where is explicitly asked that discussions take place in
the list and not back-channel, it seems like it would make sense to
have the header set so that replies are sent to the list by default.