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Microsoft® Exchange servers use Simple Mail Transfer Protocol (SMTP) to communicate with each other and to send messages. SMTP is part of the Microsoft Windows Server™ 2003 or Windows® 2000 Server operating system.
The Exchange Server Transport and Routing Guide discusses basic components of transport and routing, explains how SMTP works in Exchange Server 2003, provides information on configuring a routing topology, discusses deployment scenarios, suggests ways to help secure your infrastructure, and offers troubleshooting tips.
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Download Microsoft Exchange Server 2003 Transport and Routing Guide to print or read offline.