Suddenly stopped getting email notifications for comments

Hi all, on Wednesday I suddenly stopped get email notifications of new comments or approved comments on my photography blog.

I haven’t made any changes anywhere, I just suddenly stopped getting emails, thought it odd so logged in and saw loads pending! I then made a test comment and got no notification for that, or any of the pending ones once approved.

I use Gmail to have my emails pushed through my domain to that, so I can send and receive website emails through the Gmail system. I checked spam, but they aren’t going in there either.

Any suggestions appreciated ??