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

I am working on ASP.Net Solution, and when I tried to send an automated email using C#, I got the below error: Server returned status code 530 – The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Client was not authenticated Exception details: Message: The SMTP …

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