simpleContact is first and foremost a form builder. There is no functionality for sending emails; it is just about gathering permission.
This is because there is a thin line between mass mailing and spamming. Without tools for spam testing, checking messages display properly in email clients, scheduled sending, managing bounces and unsubscribes, reporting etc you don't have a real solution.
I plan on adding features that will enable you to use your data with some of the excellent, full-featured mailshot systems that already exist like Campaign Monitor.
Update: simpleContact Pro includes CSV export which you can use to import your list into many mass mailers.