Are you receiving email notifications on all your emails? If not it is a setting on your phone or in your email.
On the RR side, from the thread's page click on Thread Tools, Subscribe to this thread, select instant notification by email from the drop down menu, click add subscription.
From Your User CP Subscribed threads page you can also check the box on the thread, and scroll down to the bottom and select instant email notification from that drop down and click GO.
Make sure your email address is correct on your profile page.