Learn how to set up the Mailgun settings in a screencast format by Clicking here.
If you're planning on using either the client or server-side Email module or requiring your users to confirm registration by email with the Users module, then you will need a valid Mailgun account.
Once you have your account set-up you will need to provide your Sending Domain and Secret API Key from Mailgun to your Coronium Core system.
Using the Webmin, navigate to the Configuration section and enter the requested information under the Mailgun tab. Click the Update button to add your credentials.
You can now use the Email module, confirm user registrations, and send password resets with both the client-side and server-side Users module.