Can a donation receipt be sent automatically?

With every form submission, is is possible for a receipt to be emailed to every donor that contributes money?

By default, the receipt will be sent automatically to the user after donating through the payment gateway. 

If you want to add an autoresponder to your form, please follow this guide: https://www.jotform.com/help/26-Setting-Up-an-Autoresponder-Email. This will also send a response to the user who submitted the form a copy of their submission. You can also customize the message in the Email Content of the Autoresponder email. To do that, please follow the screen animation below:

I hope that helps. If you have questions, please let us know.