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If you have problems sending and receiving email messages, you can delete the email account and then create it again.
1. Find "Mail"
Slide your finger downwards starting from the top of the screen.
Press the settings icon.
Press Accounts & sync.
Press the menu icon next to the required email account.
2. Delete email account
Press REMOVE ACCOUNT.
3. Return to the home screen
Press the Home key to return to the home screen.