Moderated recipients

Exchange enables you to apply moderation to mailboxes, contacts, and distribution groups. When moderation is enabled, any message addressed to the recipient must first pass through a moderation phase to approve or reject the message. Rejected messages are returned to the sender, and approved messages are allowed through for delivery to the original recipient. Moderation occurs in the transport service as a form of rule applied to messages after they are submitted by the Mailbox Transport Submission service. The scenarios to which moderation caters include the protection of sensitive mailboxes (such as those of executives) by forcing communications to be moderated by someone such as an administrator or of external contacts ...

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