You can enable Symantec Messaging Gateway's Bounce Attack Prevention technology to eliminate non-deliverable receipt (NDR) messages that are a result of redirection techniques commonly used by spammers.
Learn more about bounce attacks and how Symantec Messaging Gateway can help you defend against them.
Bounce attacks can be used to leverage the initial recipient's "good" reputation when sending spam, pollute the initial recipient's IP reputation, or create denial-of-service attacks at the target's server.
Configure your policy groups to use Bounce Attack Prevention.
Once you configure Bounce Attack Prevention in the Control Center Settings page, you must enable the policy groups to which the system should apply validation and assign a Bounce Attack Prevention policy.
Lastly, you must enable your policy groups for Bounce Attack Prevention. You assign a spam policy or unwanted mail policy that describes the actions that you want Symantec Messaging Gateway to taken when a message does not pass bounce attack validation.