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I just checked the notification for your form: http://www.jotform.us/form/61326978152158 , and some of the recipients were in bounce list, I have white-listed them, so this should solve the problem: https://www.jotform.com/help/262-How-to-Remove-Your-Email-Address-from-Bounce-List
In addition to this, you may white-list our domain names, if the issue continues, as we use Amazon SES method for "firstname.lastname@example.org" sender:
Let us know if you need more help, we will be glad to assist you.