Within Teamwork, you can update your notification preferences to only receive notifications for items you are following.
To enable this, click your profile image to the top right of your site and select Edit My Details from the dropdown menu.
Select the Preferences tab in your details modal and toggle on the Show only notifications for items I'm following option.
You can disable this preference at any time by toggling off the setting.
For more information, see: Reducing Project Email Notifications