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.
That is because your email address has been added to our bounce list.
firstname.lastname@example.org is IN the bounce list
smtp;550 Message rejected
I've fixed this for you, but to prevent this from happening again, you should do our recommendations from the following guide.
Whitelisting us is one of the important steps so you should do. The guide also explains how you can remove your email address to our bounce list.