Transport rules
Exchange 2007 was the first version to include transport rules, which allow administrators to create conditional processing for messages as they pass through the transport service. Rules can be applied to messages that remain within the organization and to those that enter or leave the organization. Many rules are designed to ensure that users comply with company or legal regulations. The same kind of intervention and examination of en-route messages was possible with earlier versions of Exchange, but only at the cost of developing expensive installation-specific “event sinks” that could only be written by developers with substantial knowledge of Exchange internals. Event sinks were not for the fainthearted, but as the complexity ...
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