First, login to your Powerschool administrator account. Within your account, select "View Field List" on the main landing page.
In the filter text box at the top, type in the phrase "email."
Within the page, you should be able to search for the field name that houses the student emails. Depending on how it is setup for your district, the name of this field may vary. In the screenshot above you can see the circle around the field name for our demo account.