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You can also exercise Send As rights to test Mailbox Audit Logging, as shown in the following table. For example, suppose you investigate a complaint that someone is sending mail as the VP, Jim Masters. You determine that two people have been granted Send As permissions to the mailbox. The VP (Jim) states that Paul is legitimately sending mail as him. So, you search the mailbox audit log for instances of other users sending mail as the VP. By initiating a mailbox audit log search to asynchronously look for one or more mailboxes, you can check to see whether the complaint has validity. You can even designate the search results to be sent to you by email.
Note
It is not possible to create a mailbox audit log search using Exchange Management Console (EMC), but you can do it with Exchange Control Panel (ECP) in Exchange 2010 SP1.