Tony Houghton wrote: [...]
What about using the above headers to redirect to an auto-responder set up to ask the author to change the subject and resend to the list.
Or just putting something like, "PLEASE CHANGE THE SUBJECT IF YOU REPLY TO THIS" in capitals at the top of every announcement might help a lot.
Don't know if that should be the solution, but if asking people something, then this should be to *really* start a new thread instead of changing the subject, which would only cause a mess in clients capable of displaying a thread view. The changed subject, if replied to a thread message would be sorted in the same thread. Maybe it's too fancy, maybe people just aren't used or even aware of thread views and just sort by date or subject... Or maybe it's too much of an effort having to also fill in the list address when starting a completly new message, as compared to just hit reply and (maybe) edit the subject...