If you aren't receiving emails that your site is sending out, please check to see if you are "bouncing."

You can check and clear your status here:


Look for the heading roughly in the middle of the page that says Bounce status and to the right of that it will say either "Your email address is currently not flagged as bouncing" or it will have a link to request that we try again.  

Ref article: https://support.google.com/a/answer/1185267?hl=en