This simple addon will allow you to set usergroups that will only be able to start conversations with staff. This is useful if you have new users registering and sending spam conversations to your users.
Generally in XF to avoid that, you would revoke the start conversation for the registered group, Problem with that is the user can not start a conversation with staff if needed. This addon solves that problem.
Compatible XF Versions 2.1 , 2.2