FreePBX even tells you this on the 'news' when you login, however the instructiosn are 'lacking' any real details ...
Auto-notify is turned on by defuault, so all that's missing is knowing how and where to add the email address:
- Login to your FreePBX Admin Panel
- Select Admin > Module Admin
- Click on the 'shield' top right
- Enter your email address
If you don't see the shield (with optional gecko image) first update your PBX to the latest fixes and then force-refresh the admin pages in your browser