Peter Niederwieser wrote
users often post to the parent forum, without realizing that these posts won't go to the mailing list. This is a very common mistake. Is there a way to prevent people from posting to the parent forum?
Yes!
At the parent forum level go to OPTIONS > USERS > CHANGE PERMISSIONS and remove the ability of users to create and reply to posts.
Then go to each sub-forum in turn and change the "Inherit" setting to "Custom" and reinstate those permissions for those sub-forums.
Volunteer Helper - but recommending that users move off the platform!
Once the admin for GregHelp now deleted.