Manage email notifications within the Notification Settings page. To get there, at the very top of the page, click on the menu by your name. Then click "Notification Settings."
Here, you can subscribe/unsubscribe from different email lists and choose to have your in-platform messages forwarded via email. You can also check or uncheck the boxes to enable/disable receiving email notifications. Under "Frequency," choose how often you want to receive notifications - either immediately, or in a daily or weekly digest.