Moving mail

The CAS role is a critical part of the Exchange feature set, but you could certainly argue that the transport system is just as important—without transport, there’s no way to transfer mail between servers, and we’d be back in the days of Microsoft Mail and Lotus cc:Mail, when individual servers were disconnected islands of email use. In the next chapter, you’ll dig into the guts of the Exchange 2013 transport system and see how Exchange implements this important functionality.

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