How to Enable or Disable Outlook E-Mail Postmark Validation
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
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.
Before You Begin
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:
You have reviewed Anti-Spam and Antivirus Functionality to understand the general strategy for configuring all anti-spam agents so that they work together efficiently for your organization.
You have read Configuring Content Filtering.
Note
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.
Procedure
To use the Exchange Management Shell to enable or disable Outlook E-mail Postmark validation
To enable Outlook E-mail Postmark validation, run the following command:
Set-ContentFilterConfig -OutlookEmailPostmarkValidationEnabled $trueTo disable Outlook E-mail Postmark validation, run the following command:
Set-ContentFilterConfig -OutlookEmailPostmarkValidationEnabled $false
For detailed syntax and parameter information, see Set-ContentFilterConfig.
For More Information
For more information about how to configure content filtering, see the following topics: