Are you getting email notifications from Mastodon that you don't want?
You can change your email notifications by doing the following:
1. Log in on your server's website
2. Click ⚙️ Preferences (or ⚙️ on mobile website)
3. Click on Notifications (on the mobile website you may need to click ☰ and then Notifications)
4. Un-tick the boxes marked "Events for e-mail notifications" to remove the notifications you don't want
5. Click the "Save changes" button at the top of the screen