Gmail Error :The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required

Question

I am using following code to send email. The Code works correctly in my local Machine. But on Production server i am getting the error message

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Answer 1

I used all of the above mentioned solutions but it finally worked only after i enabled IMAP Access from Gmail settings Link to Enable IMAP Access in gmail settings

Of course, the points in the other solutions were required too.