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What happened is that the email address was in bounce list. I have removed it so you should get notification for the submissions by now.
If you noticed you are not receiving notification, you can check the email to see if it not in bounce list from from your JotForm account - How-to-remove-your-email-address-from-bounce-list
Refer to the following guide to help prevent similar issue: How-to-setup-email-alerts-to-prevent-emails-not-being-received-issues