iPhone Mail Setup Removal
1. From your iPhone home screen tap on settings.
2. Scroll down and click on General.
3. Scroll down and click on Profiles
4. Click on the profile with your email address on it.
(In the image below, the email is email@example.com)
5. Click the red Remove button
6. Click Remove to confirm
7. Once the Removing Profile page closes, you're done!