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C# application - Sending email from Gmail with SMTP authentication

If you are getting the below error -

“The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required”
1. Check if you have received an email notification -

We recently blocked a sign-in attempt to your Google Account

Sign-in attempt details
Date & Time:
Location:

2. Check this link and acknoledge the sign in attempt as yours -
https://security.google.com/settings/security/activity

3. Go to this link and enable access to less secure applications
https://www.google.com/settings/security/lesssecureapps

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