Outbox is a 6 letter English word. It's valid Scrabble word worth 15 points. It's valid Words with friends word worth 17 points.
You can make 45 anagrams from letters in outbox (bootux).
First recorded in 1860-65; out- + box2
He could outrun, outride and outbox any boy of either side the Potomac, and had proved it in many contests of skill.
And then you discover the mistake only after the statement has departed the outbox.