Did you set up the script on a local Windows machine for testing and want to test the emails?
If you haven't done so already, then you will need to download and install an SMTP server. Then you will need to configure the PHP php.ini file to use the SMTP server that was installed. (Restart your web server after modifying the php.ini file)
In the Million Dollar Script Main Config, DO NOT tick 'Use SMTP' settings, PHP will figure out the SMTP settings, and use SMTP in the background.
Note: In most cases, you do not need to tick 'Use SMTP' settings in Main Config. The script can use the default mail() function which comes with PHP