If you have an account with AWeber, Campaign Monitor, MailChimp or Wufoo, you can connect them in the Leads section of the CRM. Once connected, Raven will automatically import leads from the lists you select, which can then be added to your managed contacts.
Leads are potential customers and clients, gathered through mailing list signups and other campaigns. Using Raven, you can contact these leads and, ideally, convert them into paying business for your company.