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Originally Posted by jc10002

can someone please tell me how as admin to automatically select "Instant Notification by Email" for every user?

I think there's a SQL Query under Maintenance that will do this. But be careful for at least two reasons.
1) Too much email - especially unexpected emails - and a few of them will start marking it as spam, getting you blacklisted.
2) Servers (especially shared) have severe email limits, after which odd things can happen like dropped emails - much more important emails.