At the time you cannot setup automatic emails without the use of an event (ie. push of a button). I have seen clients create a generated Grid of Customers that fit a certain condition on their Home Dashboard. Using an OnScrenLoad event they then process the emails. But this will add lag time for the screen to load and can be a nuisance when signing in.
It's not automatic per se, but it will allow you to aggregate a list of customers that fit a condition and send out mass emails without having to click on any objects.