JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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.
Upon checking one of your form, I can see that the recipient email was in bounce list:
Please check if the recipient of your other forms are in bounce list: https://www.jotform.com/help/262-How-to-Remove-Your-Email-Address-from-Bounce-List
In addition to this, you may whitelist our domain names, if the issue continues, as we use Amazon SES method for "email@example.com" sender. Here are our domain names:
Let us know if you need more help, we will be glad to assist you.