The Daily Digest opt-in is in your profile
Click your name in the upper right corner
Go to your profile
Click Edit
Un-check the Daily Digest email
Save your profile with the new setting
As an Admin, you will get the Daily Digest email showing you valuable changes in your account, such as new leads and other customer actions. If you don't wish to receive these emails, it's easy to stop receiving them, and then start again in the future.