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[Solved] ASP.Net Error: The SMTP server requires a secure connection or the client was not authenticated

George61...

I got an error in my browser

The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Authentication Required.

dharmend...

0 1

Refer below article.

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GMAIL Error: The SMTP server requires a secure connection or the client was not authenticated