Watched Threads Admin Bulk Delete

I did search for this in the forums here, but was unable to find a viable solution.
Is there a way in the admin area (2.3 (CLOUD HOSTED VERSION)) to bulk update the users to remove some of the watched threads emails that go out?
Also, is there a way to have the 'Watch This Thread' NOT be automatically checked on a new post or thread?
I am getting absolutely killed by the amount of emails that go out for watched threads.
(a simple way for a non-programmer).

Thanks in advance

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