I just switched over to Apple's Mail client and I'm liking it a lot so far. One thing that I haven't figured out yet is how to filter my mailing lists using "smart mailboxes." I thought something like this would work: http://i.imgur.com/vk4mmBh.png .. but all the emails still end up in my normal inbox. When I click the smart mailbox on the sidebar it's empty. What am I missing here?