how do I send a copy of all in/out e-mail to the audit department?

One of our clients has a dedicated server and have some sensitive information which they would like to protect. They are suspecting that one of their employees is selling info to the competitor.
What do they need to do to have a copy of all incoming and outgoing e-mail from an account to be also sent to the auditing department?

server RHE3 / cpanel / WHM/ and root access (dedicated server)

any help is appriciated :-)

 

 

 

 

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