Are you receiving email notifications from Mastodon which you don't want?
You can edit your account's email notification settings using the instructions in this guide:
➡️ https://fedi.tips/how-do-i-stop-receiving-email-notifications-from-mastodon
(If you're on mastodon.social the instructions will be slightly different due to its experimental web interface. Click ⋯ next to your profile name and then "Settings", then follow steps 3 to 5 in the guide.)