How to Enable or Disable Open Proxy Server Detection for Sender Reputation

Exchange 2007

Microsoft Exchange Server 2007 will reach end of support on April 11, 2017. To stay supported, you will need to upgrade. For more information, see Resources to help you upgrade your Office 2007 servers and clients.


Applies to: Exchange Server 2007, Exchange Server 2007 SP1, Exchange Server 2007 SP2, Exchange Server 2007 SP3

Topic Last Modified: 2006-09-18

This topic explains how to use the Exchange Management Console or the Exchange Management Shell to enable and configure sender reputation to detect open proxy servers. One of the characteristics that sender reputation evaluates is the result of a test for open proxy servers. Frequently, spammers route messages through open proxy servers on the Internet. By routing spam through open proxy servers, spammers can send messages that appear to originate from a different server than their own.

To perform the following procedures on a computer that has the Edge Transport server role installed, you must log on by using an account that is a member of the local Administrators group on that computer.

Also, before you perform these procedures, confirm the following:

By default, open proxy server detection is enabled. The following procedure explains how to enable and disable open proxy server detection by using the Exchange Management Console and the Exchange Management Shell.

  1. Open the Exchange Management Console on the Edge Transport server.

  2. In the console tree, click Edge Transport.

  3. In the work pane, click the Anti-spam tab, and then select Sender Reputation.

  4. In the action pane, click Properties, and then click the Sender Confidence tab.

  5. Select or clear the Perform an open proxy test when determining sender confidence level check box as appropriate.

  6. Click OK to save your changes and close the dialog box, or click Apply to save your changes without closing the dialog box.

  • To enable open proxy server detection, run the following command:

    Set-SenderReputationConfig -OpenProxyDetectionEnabled $true
  • To disable open proxy server detection, run the following command:

    Set-SenderReputationConfig -OpenProxyDetectionEnabled $false

For detailed syntax and parameter information, see Set-SenderReputationConfig.