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To check if your recipient address is in the bounce list, you can follow this guide: http://www.jotform.com/help/262-How-to-remove-your-email-address-from-bounce-list
To prevent this happening, I would strongly suggest checking this link: http://www.jotform.com/help/208-How-to-setup-email-alerts-to-prevent-email-bouncing-related-issues
You can also check if the emails were successfully sent or not by following this other guide: http://www.jotform.com/help/293-How-to-view-all-your-form-Email-History
Do let us know if that works.