prevent large lists from being set to open send types
A couple times now we've had a list admin subscribe tens of thousands of people without their permission and then send mail to the list. Then a bunch of those people reply saying "please remove me" and their replies go to the list because the list is configured to allow that. This snowballs and totally takes out the listserver.
I would like a feature where lists over a certain size are not allowed to be set to send types that allow anybody or member posting. I suppose some people might want large lists with member/anybody posting that's moderated, so maybe there should be two tunables:
- The subscriber count over which a list is not allowed to have unmoderated anybody or member posting (this could also be split into two if we think it's worth differentiating between anybody and member).
- The subscriber count over which nobody but editors are allowed to post (like newsletter)
(from redmine: created on 2011-03-16, closed on 2014-07-03)