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I checked our email logs for the address in your notifications and the notifications were indeed failing to be delivered. It looks like your address was rejecting them as spam. When enough emails get rejected, the address rejecting them is placed on our bounce list. This happened in your case. The error given was:
Reason(s) : smtp; 550 permanent failure for one or more recipients (s****@d***********net:550 "The mail server detected your message as spam and has prevented delivery.")
I removed your address from our bounce list and the notifications should attempt to send once again. I would recommend whitelisting our domains and IP's with your email provider to ensure the email do not continue to be rejected: