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.
I think I am having the same problem you are.
I've check both email addresses and email address firstname.lastname@example.org is IN the bounce list. I will now remove it for you and it should be working fine now fine.
Reason(s) : 5.1.0 - Unknown address error 550-'Blocked'
If you need further assistance, please let us know.
Can you please open a new thread with regards to your query and include URL of the Form for further assistance?