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I checked your "Notification" settings and the related email address. On the mail log, it seems that the most recent submission sent without having any issue. Below, you can check it:
In this case, I suggest you to check your Spam, Junk, Promotion etc. folders and also, check if there are any spam filters on your email program or email client.
Alternatively, you can use the SMTP method to send your emails with using your server, so you can beat that problem completely.
To do that, please follow the instructions from How to Setup SMTP for a form page.
If the problem insists, please do let us know.