Professional Windows® PowerShell for Exchange Server 2007 Service Pack 1

Configuring the Edge

Transport Server Role

Chapter 7 discussed the transport architecture in Exchange Server 2007 and Hub Transport

server role. This chapter discusses the Edge Transport server role, which is identical to the

Hub server role in many respects and implements the core transport architecture. Although both

roles share identical features, they differ in default configuration and functionality. Whereas the

focus of the Hub Transport server role is intra - organizational email communication and

compliance, the focus of the Edge Transport server is for inter - organizational email communication,

message hygiene, and security. This implementation of the Edge Transport server new to the

Exchange line of messaging products arose as a result of increasing Unsolicited Commercial E - mail

(UCE) volume and the risk of denial of service attacks perpetrated via email. It reduces the attack

surface of such threats by providing a means for organizations to segment such email traffic even

before it enters the Exchange organization, while preventing access to internal resources. Some of

the features of the Edge Transport server have been implemented in earlier versions of Exchange,

however this role segmentation was never possible in any other version of Exchange. Message

filtering functionality such as sender, Recipient, connection filtering, ...