Smart mailboxes in Mail

Today I discovered an amazingly useful feature in Mail (for Mac). You can create so called “smart” mailboxes, based on any or all of several criteria including the from address, subject and message body.

The immediate use which occurred to me for this is to keep a handle on how many of those infuriating FaceBook notifications I receive. By creating a smart mailbox for all such messages, I can easily clean out my inbox of all outdated junk.