DeleteMail is a new
Enabling this will add a ‘Delete All’ or ‘Archive All’ button to your inbox or mail folders in Mail app
● Open Mail app, tap "Edit" button, tap "Delete All" button and confirm. All your e-mail will be deleted.
● You can enable or disable this tweak via Setting app. There are no new icons added to your homescreen.
You can purchase DeleteMail from the Store for $.99.