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If you have problems sending and receiving email messages, you can delete the email configuration and then create it again. Follow these instructions to delete an email configuration.
1. Find "Accounts"
Slide your finger down the display starting from the top edge of your phone.
2. Delete email configuration
Press the required email account.
Press Delete to confirm.
Slide your finger up the display starting from the bottom edge of your phone to return to standby mode.