BuddyPress.org

I am trying to figure out how to setup Buddypress to automatically email users that have been inactive for a certain amount of time (let’s say 1 week for example) and remind them to come back to the site. I haven’t been able to find any plugins that do this, and I don’t even know where to begin with it. Since the all the data is saved (Email address & last activity time), it should be possible. Anybody know how to do this? Thanks!