GlassFrog lets you choose how frequently you receive email notifications.

To change your settings, find the Notifications option in the menu that pops up from your profile name:

You will see many options on the Notifications page:

Make changes to your notifications in each of your circles by selecting or un-selecting the check boxes.  You can subscribe to Governance, Tactical and Note changes.  

By default you will receive individual emails for the circles in which you are a member, but you can change that to only one email a day if you'd rather get fewer emails.

Premium GlassFrog users can also add subscriptions for additional circles in their organizations.