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I've checked your forms and I've seen that the email firstname.lastname@example.org was in our bounce list as you can see the screenshot below:
I've removed the email from our bounce list and you are able to receive emails normally now.
Moreover, you can check any email if it is in our bounce list or not. Please check the following link to see how it is done: https://www.jotform.com/help/262-How-to-Remove-Your-Email-Address-from-Bounce-List
Please check it and If you need any doubt or question, do not hesitate to contact us.