In the Settings app, open Mail. Select Accounts from the drop-down menu at the top of the screen. Select a mail account you wish to delete. Select Delete Account from the drop-down menu. To confirm, select Delete Account or, in some cases, tap Delete from My iPhone.

That’s because the highest number is determined by the hardware, rather than anyone user. A single gadget can only have three iCloud accounts throughout its existence. This information may not be changed or deleted in any way.

If your iPhone was set up with a corporate email account, there may be a profile on it. To remove the profile, go to Settings > General > Profile and select Remove Profile.

Go to Settings > Passwords & Accounts (or Settings > Mail for older iOS) and change your email account. nInstead of TURNING THE MALLET ON, TURN IT OFF.

While the emails are highlighted/selected, keep the Shift key pressed and hit the Delete key to remove them.