Datasheet

32
Chapter 1
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Designing and Planning Messaging Services
Transport will deliver a local copy to the recipient in Site 2 and deliver one message, including
recipients in Site 3 and Site 4, to the Hub Transport server in Site 3. As you can see, especially
for messages with large numbers of recipients, this feature saves a lot of bandwidth.
External Message Routing
Now you’ve got a grip on internal message routing, so let’s turn to routing of the external variety.
In this section I will provide an overview of what features exist for message routing to external sys-
tems, like the Internet or foreign systems.
In Exchange Server 2007, external connectors are classified in the following three ways:
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Send connectors
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Receive connectors
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Foreign connectors
These types of connectors can be configured on Hub Transport and Edge Transport servers.
Connectors can be configured using the Exchange Management Console, but many more details
are available when using the Exchange Management Shell.
Send and Receive connectors always use SMTP as their message protocol, where Foreign
connectors might use other message protocols, such as X.400, to transmit messages.
You do not need to configure an Internet connection if you have an Edge
Transport server, as it will be installed automatically when you subscribe the
Edge Transport server to the Exchange organization.
Send Connectors
Using Send connectors you can configure an outbound SMTP connection. Send connectors
allow you to do the following:
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Set one or more source servers that the connector uses to deliver messages.
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Configure a dedicated address space for the connector.
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Decide where to route the messages to (by using a smart host or just using DNS MX
resolution).
Here’s how Send connectors factor into planning: If you don’t use Edge Transport servers
as Internet smart-relay hosts, then you should include Send connectors wherever you have
a network connection point, such as a direct partner connection, an internal re-route, or an
Internet connection.
Receive Connectors
To receive external messages, you need a Receive connector. This connector acts as an
inbound connection point that you can configure to accept connections based on IP address
ranges and port numbers.
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