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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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The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Authentication required
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Client was not authenticated. Failure sending mail. (4316055)
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SMTP server requires a secure connection or the client was not authenticated | Email Sending ASP.NET - YouTube
c# - The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required? - Stack Overflow
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530 5.7.1 Client was not authenticated" Error message from Exchange
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