Can I send a confirmation email with a unique ID to each form submission from a user?

Yes, you can do that. You can either use our Unique ID or Random Value Generator widget.

For the Unique ID, please follow the steps here: https://www.jotform.com/help/79-Add-Custom-Unique-IDs-to-your-Form-Submissions.

For the random value generator widget (https://www.jotform.com/widgets/random-value-generator). 

Guide to add the widget: https://www.jotform.com/help/252-How-to-Add-a-Widget-to-Your-Form.