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Are you referring to this form - http://www.jotformeu.com/form/52295142943356? I checked the mail logs of the recipient email of the Notification email of the form and it seems that the email are sent successfully.
Are you still encountering this issue? I noticed that you are using Custom Sender Email in your Notification. Can you try to use email@example.com as your Sender Email and see if it will work? If you are referring to a different form, can you provide to us the link or name of the form in question so we can further check.
We will wait for your response.