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Importing overwrites the existing rules. On an Edge Server, exporting the transport rules is used as a backup mechanism or to import them into other "cloned" Edge Transport servers. 58 Summary Exchange Server 2007 takes great steps forward in controlling messages and message transport from an administrator perspective. Some tasks that were challenging or required third party applications in previous versions of Exchange have been made more accessible through transport rules in Exchange 2007. With the Edge Server role concerned with security and the Hub Transport role focused on compliance and policy enforcement, Transport Rules provide a much improved set of tools for administrators to manage message flow in their Exchange organizations.

For all the Exchange Server cmdlets run Get-ExCommand in the EMS. Microsoft maintains a library of these cmdlets as well. aspx. The Connection Filtering Agent is concerned with the source IP address of the host that is connecting on TCP Port 25. The agent references the IP address of the host making the connection request against an IP Allow List and an IP Block List. In addition it can query an IP Block List Provider or an IP Allow List Provider. If the IP address is listed on a block list, either internal or at a block list provider, and not on an allow list, then the connection is dropped.

In the latter case, one Edge Transport server will be used in preference to the other, with the secondary Edge Transport server only being used if the primary Edge Transport server fails. For outbound messages, the preferred option is to create Edge Subscriptions for each Edge Transport server. An Edge Subscription essentially links the Edge Transport server to the Hub Transport servers in a specified Active Directory site, thereby allowing, via Send Connectors, email messages to flow from the Hub Transport Servers to the Edge Transport servers.

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