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DLP Prevent SMTP doesn't actually take any action but rather marks an X header on the email that it delivers back to the MTA. The MTA is responsible for taking an action based on the X header. If you set an action rule to Redirect, you will need to configure the MTA to take what ever action you desire based on that header including redirecting it to a different email. However, the MTA can take any action on the email regardless of how the Prevent marked the email; e.g. If the email was marked redirect, the MTA can be configured to bounce or quarantine it.