The DomainKeys Verification Category of No Signature page allows you to choose an action when the DomainKeys Verification filter is enabled.
This action activates when the message does not have a signature (Selector).
Important: After updating verification settings be sure to restart your SMTP and Queue Manager services.
The action to be taken when the query result is met
Action. Select one of the following actions:
Tip: We recommend that you select the Insert X-Header option instead of Delete Message until you know that the DomainKeys options are setup to best suit your filtering requirements.
Prefix subject with. If you want to add a custom prefix subject to messages that are identified as DomainKeys failure, select the Prefix subject with check box (cleared by default). The default subject prefix is entered in the text box to the right and is based on the DomainKeys failure. You can also enter a custom message in this box.