For example, here on DP, if you reply to a thread or start a new thread, it automatically subscribes you to a "No email notification" subscription. How do you make it do that?
Go to User CP and click on Edit Options Go down to messages and notifications and choose either instant email notification, daily email notification or weekly notification, whichever one you like
What if you are the administrator of the forum and want to change all users' settings? I guess this one is tried to be asked here.