Buy Me a Coffee sends you email notifications to update you on various activities happening on your page. This includes updates on new supporters, members, comments, and extra claims.
However, it is completely optional whether you want these updates and you can easily configure this setting from your notifications page.
To do so, go to your Buy Me a Coffee dashboard -> Settings -> Notifications
Once you are in your notifications settings, you can choose which email you wish to receive by checking and unchecking the boxes beside them. Once you are done with the setting, you can click on "Save changes" to apply the changes.