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 email address you provided and that email address was on bounce list. Our system gave following result:
firstname.lastname@example.org is IN the bounce list
Reason(s) : smtp; 550 Requested action not taken: mailbox unavailable or not local
I have now removed it from our bounce list and it should be working fine now.
You can follow this guide on how to check and remove the email from bounce list.
Also you can Whitelist JotMails IP Addresses.
Please test your form and check if you are receiving submissions now.
Feel free to contact us if you need any further assistance.