Database Mail The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required in ASP.Net Application.

 The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required in ASP.Net Application.

Ref:

https://www.aspsnippets.com/Articles/GMAIL-Error-The-SMTP-server-requires-a-secure-connection-or-the-client-was-not-authenticated.aspx


when you configured database mail but still you are getting error 

solution:


you will get mail from your gmail account  and click on below link to activate it

Kindly click above link and turn on 

Now sending test mail 

success 

now we got mail from dbmail