The Hub Transport Server role is responsible for routing messaging, not only between the Internet and the Exchange organization, but also between Exchange servers within your organization.
All messages are always routed via the Hub Transport Server role, even if the source and the destination mailbox are on the same server, and even if the source and the destination mailbox are in the same Mailbox Database. For example, in Figure 8, the Hub Transport Server is responsible for routing all messages:
Step 1: A message is sent to the Hub Transport Server.
Step 2: A recipient on the same server as the sender means the message is sent back.
Step 3: When the recipient is on another mailbox server, the message is routed to the appropriate Hub Transport Server. This is then followed
Step 4: The second Hub Transport Server delivers the message to the Mailbox Server of the recipient.
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