Unable to receive email notification upon testing it using Test Email button

Not receiving test emails from your form. When I click on the send test email, it says email sent successfully, but I have never received it.

Any help is appreciated.

Thank you

I would like to apologize for the inconvenience, but may I just ask if you change/update the email address in your notification? Because if you did change it to where it is not already the default email address on your account, then, you will not be able to receive the notification if you use the Test Email button. The Test Email button works only with the default email address on your account. To test your new email address, you have to load your form, fill it up and submit it. 

You can check this guide for more information: How-to-properly-Change-and-Test-a-New-Email-Recipient-Address-

I hope this helps. Let us know if you need any further assistance. Thank you.