What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
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I have already removed your email from the bounce list, So it should work correctly now.
Result: firstname.lastname@example.org was IN the bounce list
Reason(s) : 5.1.0 - Unknown address error 550-'#5.1.0 Address rejected.'
Please refer this guide to prevent this issue to happen again: How to setup email alerts to prevent email bouncing related issues
Let us know if you need further assistance.