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- Question
Email problems: error code 0x800CCC91 - POP3 username invalid
- Answer
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This error is usually caused by a username or password being entered incorrectly. Use the link below for more information about setting up email clients to manage your BT Yahoo! email account:
An introduction to setting up emailFurther information
Email problems: using the error code to help fix a fault
- View Answer at http://bt.custhelp.com/app/answers/detail/a_id/799/c/346,412,418
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