The DomainKeys Verification Category of Verification Failed page allows you to choose an action when the DomainKeys Verification filter is enabled.
This action activates when the message has a failed verification.
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
Tip: We recommend that you select the Insert X-Header option instead of Delete until you know that the DomainKeys options are setup to best suit your filtering requirements.