Every person who willfully opens or reads, or causes to be read, any sealed letter not addressed to himself, without being authorized so to do, either by the writer of such letter or by the person to whom it is addressed, and every person who without like authority publishes any letter, knowing it to have been opened in violation of this section or any part thereof, is guilty of a misdemeanor. R.L.1910, § 2786.
Oklahoma Legal Code