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How to Enable or Disable Outlook E-Mail Postmark Validation

 

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

Topic Last Modified: 2006-08-10

This topic explains how to use the Exchange Management Shell to enable or disable Microsoft Office Outlook E-mail Postmark validation. Outlook E-mail Postmark validation is a computational proof that Outlook applies to outgoing messages to help recipient messaging systems distinguish legitimate e-mail from junk e-mail. This feature helps reduce the chance of false positives. In the context of spam filtering, a false positive exists when a spam filter incorrectly identifies a message from a legitimate sender as spam. When Outlook E-mail Postmark validation is enabled, the Content Filter agent parses the inbound message for a computational postmark header. The presence of a valid, solved computational postmark header in the message indicates that the client computer that generated the message solved the computational postmark. The results of the postmark validation are calculated into the overall spam confidence level (SCL) for the inbound message.

The Content Filter agent does not change the SCL rating if the following conditions are true:

  • The postmark validation feature is enabled.
  • An inbound message meets either of the following conditions:
    • It does not contain a computational postmark header.
    • The computational postmark header is not valid.

By default, Outlook E-mail Postmark validation is enabled.

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:

noteNote:
You cannot perform this procedure by using the Exchange Management Console. To enable or disable Outlook E-mail Postmark validation, you must use the Exchange Management Shell. For more information about how to use the Exchange Management Shell, see Using the Exchange Management Shell.
  • To enable Outlook E-mail Postmark validation, run the following command:

    Set-ContentFilterConfig -OutlookEmailPostmarkValidationEnabled $true
    
  • To disable Outlook E-mail Postmark validation, run the following command:

    Set-ContentFilterConfig -OutlookEmailPostmarkValidationEnabled $false
    

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

To ensure that you are reading the most up-to-date information and to find additional Exchange Server 2007 documentation, visit the Exchange Server TechCenter.
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