The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Client was not authenticated

When I tried to send automated emails using C#, I got the following error:

The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Client was not authenticated


Cause Continue reading The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Client was not authenticated

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