"Sent" and "Trash" mailboxes not syncing across devices
My "In Box" syncs across devices, but the "Sent" and "Trash" boxes do not. How do I ensure that all my mailboxes are syncing across all my devices, so that conversations can move back and forth regardless of which device I am using at the moment?
iMac, OS X Mountain Lion (10.8.2), 24" early 2009