Regroup allows you to control whether or not any users can edit their primary email address.
Once logged in click on your avatar in the top right corner and choose "Network Settings".
Now navigate to "Access" from the left menu:
Once in the Access Settings area, you will find the option to let users change their primary email address. Click the box to allow them (or not) to change their primary email. Save Settings when finished.
Note: Allowing Users to change their primary email address does not affect the Clery Act. They only need to be notified at some email address, preferably the one they will be checking on a regular basis.