When you are sorting your received forms into piles of Yes/No/Maybe/Approved, you may want to let applicants know if their form has either been Approved, or if it has been rejected with a No.

On the Form Type settings, you can set automatic email notifications to send when you do this.

To find these settings go to Applications > Application Types, then click on Edit for the form Type you wish to amend.

This will open up a little window - scroll down and find these two settings.

To change the template for the automatic emails that get sent when you tick these boxes, see this help article on amending email templates.