5 thoughts on “Error: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required.

      • try to access your gmail from the unknown device again until it does. If that does not work, try chrome however this should not be a browser problem.

        Also, with the new gmail, the red warning could also be placed else where like under the search bar for more attention.

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