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:
email@example.com is IN Remove the bounce list
Reason(s) : smtp; 554 4.4.7 Message expired: unable to deliver in 840 minutes.<452 Domain size limit exceeded>
I've fixed this for you, but we recommend checking this guide to prevent the issue from happening again:
The whitelisting part is important.