How do I turn on notification if my inbox is full?

Hello ecquaria,

Probably your email provider will reject the email in case your inbox is full. And this will lead the email you provided for notification to be directed to our bounce list. I strongly advice you to clear your inbox.

For detailed explanation about bounce list check the link

http://www.jotform.com/help/208-How-to-setup-email-alerts-to-prevent-emails-not-being-received-issues 

Best Regards