We've roughed in some email notifications, but have not turned them on yet.  In preparation for them, you can do two things to ensure you'll be able to benefit.

First, make sure at least one email address is verified and set as your default address.

You can do that from the email settings page.

Secondly, you can adjust your settings for how often you want to be told about your friends' activities.

That can be configured from the notifications settings page.

We'll also be adding other knobs and switches, to control when and how you're informed of people leaving you comments, private messages or adding you as a friend.