To pull a list of contacts that do NOT have an email address, follow these steps:
Go to the Contacts tab and click the Filter button in the top right corner
Under the Contact's section, select "email address"
Select "does not exist" and apply

To pull a list of contacts that do NOT have an email address, follow these steps:
Go to the Contacts tab and click the Filter button in the top right corner
Under the Contact's section, select "email address"
Select "does not exist" and apply