Junk button and multi sync send and receive mail needed!

The all amazing JUNK button in Thunderbird is missing when you use Postbox. With all the junk mail this should be a top priority but missing in the Postbox. A lot of the features are already in Thunderbird. Major problem people have in pop is syncing mail to other networked computers! If you can figure the solution to this one you'd make a mint. Both sent and received should be identical in all computers.