Not receiving notification emails

For the second time in the last few submissions of one of my forms, I have not received the notification email.  I have checked all folders for it.  Luckily, the other recipient has received her email and has forwarded me a copy.  Can you account for this? Thanks.

The form involved is: https://www.jotform.com/build/81802735709966

I am the second notification email recipient, dudlebean@comcast.net.

The recipient that is listed in the notification is "Dudlebean@comcast.net", please try deleting it, and adding "dudlebean@comcast.net". Also, you may add our domain names and sending IP addresses to your whitelist: https://www.jotform.com/help/145-Whitelisting-JotForm-IP-Addresses-and-Domains 

Let us know if that helps.