I was getting the below error while try to send a test email through email parameters after updating SMTP details.
The SMTP server requires a secure connection or the client was not authenticated. The server response was: Authentication required
Solution
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-> After updating the SMTP detail refresh the application page and try again
-> If the above steps does not work, login with send as email address (ex: noreply@abc.com) and update the SMTP details and send a test email.
hey
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