Google Apps Email – How to Copy Incoming and Outgoing Email to Another Account

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What I want is that all emails sent to/from user1@example.com are copied to user2@example.com. The configuration solution must not be modifiable by user1 (due to that requirement I think any solution that includes the creation of a filter in the user1 account won't suit, unless a filter in user1 account that user1 can't delete), and if the configuration is hidden from user1 all the better.

Best Answer

Here is the doc to do that.

The Content compliance setting enables you to specify what action to perform for messages based on predefined sets of words, phrases, text patterns, or numerical patterns. The content compliance setting scans messages for content that matches one or more rules that you configure within the setting. You can choose whether these messages are rejected or delivered with modifications -- for example, to notify others when the content of a message matches the rules that you set.