It also includes 3 email templates and 5 PDF links a month. On Free, emails sent with a chosen look (a mail design) carry a short HawkOpen line in the footer; plain emails do not.
Scheduled sends, reply detection and reminders start with Pro. The address book is included: up to 1,000 contacts, CSV import, saved recipient lists and campaigns to them, up to 50 recipients each. The CRM comes with Pro and Business; on Free it is a paid add-on with a 21-day trial.