Address Rewriting in .NET

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Address Rewriting
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Edge Transport servers also provide the ability to take the domain value in inbound and outbound messages and rewrite them for the purpose of maintaining a consistent namespace for an Exchange organization For example, let s say Pennywise Resort expands to four locations, each with its own subdomain under pennywiseresortcom: cancunpennywiseresortcom dubaipennywiseresortcom miamipennywiseresortcom bahamaspennywiseresortcom
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Without Address Rewriting, messages sent from each of the locations would look like <user>@cancunpennywiseresortcom (with the appropriate subdomain, of course) With Address Rewriting, as the messages are sent via the Edge Transport server, they can be rewritten as @pennywiseresortcom addresses to maintain a single company namespace outside the organization Likewise, as an e-mail comes in to an @pennywiseresortcom address, the Edge Transport server would rewrite the address to be the appropriate subdomain to ensure proper routing Table 9-2 lists the addresses that can be rewritten by an Edge Transport server TIP For outbound rewriting to work properly, you must ensure that each rewritten address is unique across your Exchange organization and that the rewritten address is included in the proxy addresses for the intended recipient
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Edge Subscriptions
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In order to be an effective first point of contact for inbound messages and last point of contact for outbound messages, the Edge Transport server will exist in the perimeter network Being on the perimeter network usually means that you need to open a number of holes in the firewall to make the Edge Transport server communicate with Active Directory
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Managing Edge Transport Servers
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Outbound Messages Rewritten
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Envelope From Not Rewritten (specified in the MAIL FROM SMTP command) Envelope To (specified in the RCPT TO SMTP command) Body To Body CC Body From Body Sender Body Reply-To Body ReturnReceipt-To Body DispositionNotification-To Body Resent-From Body Resent-To Rewritten
Not Rewritten
Not Rewritten Not Rewritten Not Rewritten
Rewritten Rewritten Rewritten
Not Rewritten Not Rewritten
Rewritten Rewritten
Table 9-2 Message Addresses Rewritten by Edge Transport Servers
Instead, Microsoft has taken a more secure approach and designed the Edge Transport server to not be a member of the internal domain and instead get its directory information by means of a one-way synchronization process between Active Directory and the Edge Transport server This is done using an Edge Subscription Edge Subscriptions define the elements of Active Directory that will be replicated to the Edge Transport server to be stored in the ADAM directory service Some implementations will have the Edge Transport server installed as a member of a perimeter domain (which is not part of the internal forest) for ease of patching and monitoring TIP You only need Edge Subscriptions if you plan on using the antispam, recipient lookup, safelist aggregations, or secure communications via mutual Transport Layer Security (TLS) features of an Edge Transport server These all require information from Active Directory to function By creating an Edge Subscription, you ll enable an Edge Transport server to first synchronize needed information from Active Directory and utilize this information
Microsoft Exchange Server 2007: A Beginner s Guide
to provide the services listed previously in this chapter The Microsoft Exchange EdgeSync service, which runs on Hub Transport servers, is responsible for the synchronization of data from Active Directory to ADAM
Active Directory Application Mode (ADAM)
ADAM is an LDAP-based directory service that provides a read-only copy of Active Directory information to applications that need to access it, but do so from a potentially insecure location ADAM synchronizes itself with Active Directory via a subscription process where data is replicated from Active Directory to ADAM (and not the other way) using Hub Transport servers, giving ADAM a viable copy of Active Directory to work with while not exposing it to modification The Edge server only needs the following specific subsets of Active Directory to be functional: Schema extensions Exchange Configuration data
Accessing Active Directory Through a Firewall
Because the Edge Transport server exists in the perimeter network, you ll need to ensure that the server only has the needed access to complete its job, but at the same time keep the number of holes in the firewall to an absolute minimum The following ports are required on the internal firewall to allow the Edge Transport server to synchronize data via the Edge Subscription: TCP 25 for e-mail communications TCP 50389 for access to Active Directory using the Lightweight Directory Access Protocol (LDAP) TCP 50636 for secure access to Active Directory using LDAP TCP 3389 for remote administration over the Remote Desktop Protocol (RDP)
Assuming there is an external firewall as well, you ll need to open the port TCP 25 for e-mail communications These opened ports will facilitate a smooth Edge Subscription, as shown in the following illustration
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