Email notifications are not received sometimes

Two email addresses are identified for notifications of reservations. One consistently gets the email confirmation.  The other has had 4 of 18 reservations that are not acknowledged and have to be researched on JotForm. Notice of payments through PayPal are not being affected. What's up with that?  I can't take a picture of what doesn't appear.

We do apologize for any inconvenience. I have checked your last edited form and can see that notifications do have a status of SENT at our end for both emails. 

I have also checked if those emails are in our Bounce list and can confirm that they are not there. I can suggest to check if those notifications are in a spam folder. 

Here is a guide, which would be of help to prevent such issues:

How-to-Prevent-Emails-from-Landing-in-Gmail-s-Spam-Folder

I hope this helps. But, if the issue persists, please let us know.

My Spam Folder is empty...no record of the four JotForm notifications.
Bizarre. I'll watch to see if it continues to happen. Maybe your checking
knocked a kink loose.
...

Please check as well if the emails are not blocked by your email provider by any chance.

Let us know if the issue persists.

Thank you!