Sending e-Mails Programmatically Using Dynadot SMTP

I have been using my Microsoft Outlook client with POP and SMTP configuration without any problem. 

Now I need to send alert e-mails using SQL Server DB Mail configuration. 

But even on the same PC that I used Outlook, Dynadot SMTP server continuously says "The SMTP server requires a secure connection or the client was not authenticated. 

The server response was: authentication required". 

I have tried it with many clients including online ones, the error stays same with above. 

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