I am trying to send the test email from Ac Starter 6.12.1.
There is something wrong
License not found
SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
2020-07-27 09:00:24 SMTP ERROR: Failed to connect to server: Connection refused (111)
You probably have setup a port that is not opened on your server.
In Configuration->Mail settings, there's an option to check which ports are opened on your server. In case you need one that is closed you can ask your hoster to open it for you.