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If you dont want to receive any notification for every reply on your email, you can simply uncheck this option (see image below)Quote
When sending notification of a reply to a topic, send the post in the email (but please don't reply to these emails.)
Or choose the Nothing at all in this option
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For topics and boards I've requested notification on, notify me of
So you can't get any notification on your email.
And you can see all the threads/subject you enable the notify function on Current Topic Notifications
Btw you can see that features on Notifications and Email on your profile.