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You are correct in your assertion that you cannot "hack" into your own computer network. The employees and other users of your network have a lowered expectation of privacy because of the fact they are using equipment not owned or maintained by them personally. The users cannot expect emails, etc., to be 100% private because of this lowered expectation of privacy and, thus, do not have a cause of action against you. Your strongest argument is the fact you own and maintain the network, etc.; your argument gets stronger if the individuals involved also knew you owned and maintained the network. Because of the above, you can use the messages as evidence of harrassment in court.
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