Admin Tools 7 and later uses Joomla's built-in email templates feature for all its emails. You can view and edit these email templates by going to System, Templates, Mail Templates and filtering by the Admin Tools component. Alternatively, click thebutton on this page.
Admin Tools tries to install its mail templates when you install or update the Admin Tools package. If you find that some email template was not installed OR if you accidentally deleted an email template you can use thebutton to reinstall the missing templates.
If you want to reset all Admin Tools email templates back to their original settings you can click on thebutton. Sure, you can always edit each one of them and click the and buttons in Joomla's interface. However, if you really want to reset ALL emails at once it's so much faster clicking just one button.