The actual steps to prepare
the Edge Transport server will vary depending on whether edge subscription and EdgeSync will be
performed. It is highly recommended that you use edge subscription and EdgeSync to subscribe the
Edge Transport server to an Active Directory site in the Exchange organization because this automates
and simplifies the configuration on the Edge Transport servers.
In this section, you examine both scenarios for configuring the Edge Transport server to function with an
Exchange Server 2007 organization: first, where no edge subscription and EdgeSync is implemented and
second, where edge subscription and EdgeSync is performed. The tasks that must be completed on the
Edge Transport server based on these scenarios are discussed.
The first scenario is where edge subscription and EdgeSync will not be performed. In this scenario, to
prepare the Edge Transport server, the following tasks are performed:
1. Ports: Verify that the perimeter network firewall that separates the Edge Transport server
from the Exchange organization is configured to enable SMTP communications on port 25.
This is required for the both the Edge Transport and Hub Transport servers to send and
receive emails.
2. DNS: The Edge Transport servers in the perimeter network and the Hub Transport servers in
the Exchange organization must be able to locate each other by using host name resolution.
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