Yes, you can elect to receive an email everytime a donation is made to your organization through JustGive. To enable this feature, log in your JustGive account, then visit the Edit Your Account section. At the bottom of that page, make sure the box is checked next to "Please send an email notification when my organization receives donations."
If it is unchecked, click to check the box, then click the Submit button to save your changes. You will then receive an email, at the email address on file with your account, each time a donation is made to your organization through JustGive.