We understand that MailTracker is not for everyone.
Simply follow the instructions below to remove the app completely and you'll be back to your original settings. Go to:
1) Settings app
4) Remove the profiles beginning with "MailTracker for firstname.lastname@example.org"
5) Hit < Back until you're at the main Settings screen
6) Mail, Contacts, Calendars
7) Open your original email accounts, slide Mail back to ON.