How can Admin monitor all outgoing/incoming emails of employees?

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http://ubuntuforums.org – Hello, How can the administrator monitor all outgoing/incoming emails of our employees? We prefer that our monitoring will be such that we get a copy of every outgoing and incoming mail. This way is much preferred over having to regularly check the employees' email accounts (inboxes and sent folder). Some bits of information that may be relevant: 1. The domain was bought on GoDaddy. 2. We are currently using Google Apps (free edition) to manage our domain emails. We chose Google Apps because we are used to and love the Gmail way of doing email. The Business edition of Google Apps (Hardware)