Email Lists are generated in two primary areas; Contacts and Members
There are four email lists that get automatically generated on your website:
Visitors that have filled out your contact form
Reviews: Visitors that leave member reviews
Leads: Visitors that try to contact your members
Newsletter: Visitors that signup for your newsletters
Contacts can be exported via the "Contacts" table in your database.
Member email lists are automatically generated and divided by membership levels. This means that you can send a specific campaign to only "paying" members, and a separate campaign to "free" members.