activity summary email

I turned off Activity Summary Emails in the settings area but users still have the option selected. How do I prevent those emails from being sent moving forward?

Does the activity summary email include all-forums/nodes or only the ones the user has access to view? If only the ones the user has access to is there a way to send an activity summary to active users vanilla or with an addon that follows the same logic?

According to https://xenforo.com/community/threads/activity-summary-email.181536/ and "Although the "Receive news and update emails" can be toggled independently of the new "Receive activity summary email", we only display the former on registration, but if checked then we will opt the user into...