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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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I have checked the email address set as the recipient of your email notifications and found out that it is on the bounce list.Result: ate*******aro@l**e.b* is IN the bounce list
Reason(s) : 554 5.7.0 [internal] sending account is NOT active
I have successfully removed it from the list and everything should work as before, however, so you could prevent this from happening again in the future, I suggest you check this guide, How-to-setup-email-alerts-to-prevent-email-bouncing-related-issues
Or, you can also try Whitelisting-JotMails-IP-Addresses
Please let us know if you need any further assistance. Thank you.