When a ticket is closed, Mojo Helpdesk sends an email to users (ticket creators) asking for a customer satisfaction rating. If this is not a feature you want to use, you can turn this off by following these steps:
Go to `Admin Settings` and then `Helpdesk Configuration`. Scroll down to the Email Settings section and then turn OFF the setting for "Send rating reminder email". On the same page, next, scroll down to Miscellaneous Settings, and then turn OFF "Allow Rating".