Inbox vs. Outbox

An electronic folder for incoming emails or text messages.

An electronic folder for outgoing emails or text messages.

A container for incoming documents, located in or near one's office or work area.

A container for outgoing documents, located in or near one's office or work area.

A container in which papers to be dealt with are put.

A box holding papers to be transmitted to others, eg, by mail.

(computing) An electronic folder serving the same purpose, but for electronic files, especially email.

(computing) An electronic folder serving the same purpose, for electronic mail.

(figuratively) The aggregate of items that demand one's attention or effort.

To box better than.

(transitive) To put (something) in someone's inbox.

(transitive) To communicate with (a person) by writing to their electronic inbox.