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We are very sorry for the inconvenience.
I have logged into your account to check, and I can see that your Email Notification is not correctly set up. For some reason, all it contains is just the text "undefined" as its body.
I would recommend that you please remove this broken notification, and set up a new Email Notification. From then on, you should be receiving any further submissions properly to your email.
Please let us know how it goes. Thank you.