In the "Scores" Section there is a "Data Filters" button that you can use to apply a filter on the reviews.
All reviews can be split into 3 subsets:
"No Email": all reviews that are left without an email address
"Non-validated": all reviews that are left with an email address that has not been validated by the user
"Validated": All reviews that are left with an email addres that has been validated by the user