Removing then re-adding your email often fixes login and not receiving email issues.
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From the Home screen, tap Settings.
If not available, swipe down from the top of the display (where the time is located).
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Tap Accounts.
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Tap the POP/IMAP (Email) account.
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Tap Delete
(located at the bottom).
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Tap Delete to confirm.
Related Topic: Add a Personal Email Account