How to stop community support email notfications

It looks like you are subscribed to the iPhone forum. That will result in emails from any activity by anyone in that forum. To unsubscribe go to the forum iPhone - Apple Community

then log in and click the Unfollow button near the top right of the screen.

To unsubscribe from all email (including from any future activity by you in any forum) log in and the click your circular user icon near the top right of the screen, click "Preferences" and then remove the checkmark in front of "Following" and "Participation."