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 have checked the email addresses you're using in your forms and I can see most of them are in our bounce list, this is the common reason for it:
Reason(s) : smtp; 554 5.7.1 Service unavailable; Sender address
I have already removed them from our bounce list so you can receive emails now, please also check this guide that will help you to avoid bouncing related issues: How-to-Prevent-Email-Bouncing-Related-Issues
This other guide will help you to check and remove an email address from our bounce list, so if you're suddenly not receiving emails you may check it here and remove if the email is in our bounce list: How-to-Remove-Your-Email-Address-from-Bounce-List
Hope this helps.
tHANKS A LOT FOR THE ANSWER.