You can set up as many email templates as you want, then send out marketing campaigns using those templates. You can create groups from your contacts--say something like a group of California based customers, or a group of people that have birthdays in June--and send specific email campaigns out to those groups.
It's really easy to do. The screen below is the email template creation page. Making a new template is easy as creating an email with the text editor on the page. If you can send an email, you can create email campaigns with UnitWise. It's that easy!