Out Box is the place where mail you have written to others waits to be sent to them.
InBox is where mail others has written to you, lands.
There's a sent box AND an outbox? I never noticed.
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"I'm sorry Katya, my dear, but where we come from, your what's known as a pet; a not quite human novelty. It's why we brought you.... It's nothing to be ashamed of, my dear, but here you are and here you'll sit."