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This is your last form ID, http://www.jotformpro.com/form/52665241216956 and I've found out that your notification email is not properly configured. Your sender email is not set. Your should make sure to set all the sender details.
I've fixed this for you. If the issue also happens to the other forms you have, please make sure to check it.
Also, this guide should also help you troubleshoot the problem:
Thank you. That seems to have sorted that problem out. Do you have any news on my other issues?
Glad to hear that notification issue is now resolved. On behalf of Welvin, you're welcome. In regards to your other issue, it is still being investigated. Please refer to this thread: http://www.jotform.com/answers/672120. We'll close this thread because the issue is already fixed.