In Total Protection for DLP data sheet it is said that "The McAfee DLP Prevent appliance allows you to take a variety of remediation actions, including encrypting, redirecting, quarantining, and blocking...". By redirecting what exactly does it refer to? What does DLP Prevent redirect?
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.