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Apologies for any inconvenience.
Are you not seeing submissions in your submission page?
I have checked your account and I can only see this form, http://www.jotform.us/form/61137742126148, having submissions.
Or, are you referring to the email notification that you should be receiving in your email when your form is submitted?
Because I have checked the email address and found out that it is on the bounce list.Result: firstname.lastname@example.org is IN the bounce list
Reason(s) : smtp;550 5.2.0 YPAw1q00l05t67901PAwXb Message rejected due to DMARC. Please see http://postmaster.comcast.net/smtp-error-codes.php#DM000001
I have removed it from the list and you should be able to receive your email notifications again.
So you may prevent this kind of issue again in the future, I suggest you check the information on this guide, How-to-Prevent-Email-Bouncing-Related-Issues
You can also try Whitelisting-JotMails-IP-Addresses
Also, if you want to view the details on those email that had failed, you can check your account's email history.
I hope this helps. Please let us know if you have any other questions or concerns. Thank you.