is your email server down?

No, I checked the notification for one of your forms: http://www.jotformpro.com/form/51520825159959, and the recipient email was in bounce list: https://www.jotform.com/help/262-How-to-Remove-Your-Email-Address-from-Bounce-List 

That's why you are not receiving notifications, you may white-list our domain names, if the issue continues, as we use Amazon SES method for "noreply@jotform.com" sender:

·        jotform.com

·        email.amazonses.com

·        amazonses.com

·        jotform.co

·        secure.jotform.co

·        s3.amazonaws.com  

·        static-interlogyllc.netdna-ssl.com

Please open a new thread if you need anything else, we will be glad to assist you.