Monday, May 14, 2007

Edge transport Role is OPTIONAL

Below all four roles can be installed on a same server in Exchange 2007 Environment, Edge transport role needs to be deployed by itself into DMZ.

Hub Transport Server Role


Client Access Server Role (front End Server)


Unified messaging Server Role


Mailbox Server Role



Edge has to be installed Separate (DMZ) not a member of production domain, not a member of SMTP Domain

  • Not a member of a Domain ( it can be, not recommended)
  • Stand Alone server
  • Deployed in DMZ
  • Uses ADAM (Active Directory Application Mode)
  • It is a smart host SMTP relay server.
  • To perform recipient lookup tasks, the Edge Transport server requires data that resides in Active Directory
  • establish one-way replication of recipient and configuration information from Active Directory
  • Edge needs to know mail enabled object within the SMTP domain, therefore it pulls these information from AD.
  • Series of agents that run on the Edge Transport server, and act on messages as they are processed by the message transport components. These agents support the features that provide protection against viruses and spam and apply transport rules to control message flow.
  • Edge server uses EdgeSync service copies,
    only the information that is required for the Edge Transport server to perform anti-spam configuration tasks and the information about the connector configuration that is required to enable end-to-end mail flow.
  • Clustering Edge servers are possible and good idea for better redundancy for enterprise networks.
  • Road balancing is possible, with this configuration( DNS Round robin, content Switch)
  • Edge Transport server template is provided for use with the Microsoft Windows Server 2003 Service Pack 1 Security Configuration Wizard to help configure Windows Server 2003 at the appropriate role-based security level. Additional local policies can be configured to make the server even more secure.
  • Stop viruses and other related treats before they enter the corporate network.
  • Edge Transport rules are used to control the flow of messages that are sent to or received from the Internet
  • Edge Transport rule conditions are based on data, such as specific words or text patterns in the message subject, body, header, or from address, the spam confidence level (SCL), or attachment type. Actions determine how the message is processed when a specified condition is true. Possible actions include quarantine of a message, dropping or rejecting a message, appending additional recipients, or logging an event. Optional exceptions exempt particular messages from having an action applied
  • address rewriting
  • No more IIS, by to dependency of IIS and its SMTP stack


Purely SMTP communication, MAIL GATEWAY, IMF is recommended to be installed HERE. It uses ADAM to pull the information is needed to operate; this is one way communication from HUB to EDGE.

Best Regards

Oz Ozugurlu

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