Notificaltion Emails Not Working

Hello, first off…thank you so much for this plugin! Only thing I cannot seem to get to work are the notification emails after registration. I am seeing the registrations showing up in the admin, but I am not getting notified on either end (as the person who registered, or as the person who is hosting these events). I have all of the setting set up (I think) and none of the disable notification checkboxes are checked, so I am just not really sure where to go from here.

Any help would be greatly appreciated.

The page I need help with: [log in to see the link]