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I cannot send or receive email on Outlook 2015 for the last 3 days (been using outlook for years.

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I cannot send or receive email on Outlook 2015 for the last 3 days (been using outlook for years.

I cannot send or receive email on Outlook 2015 for the last 3 days (been using outlook for years). I have tried to reenter the account settings (using IMAP) and received the following error message:\ Send test e-mail message: Cannot send the message. Verify the e-mail address in your account properties. The server responded: 550 5.1.0 Authentication required.  My original account gives this error message: Log onto incoming mail server (POP3): The operation timed out waiting for a response from the receiving (POP) server. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).

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