I don't receive reminder emails
I set it to remind me at 8pm if I haven't practiced that day, but it never reminded me.
Hover over your user name with your mouse. Click on your Settings. Then click on Notifications and make sure they are checked to receive them.
If everything is correct already, click on the Support tab at left and explain whether you are using iphone, Android, Windows phone, Tablet and which, Computer which operating system. Give them as much information as possible so that they can figure out what the problem is.