A FortiMail administrator is investigating a sudden increase in DSNs being delivered to their protected domain. After searching the logs, the administrator identifies that the DSNs were not generated because of any outbound email sent from their organization. Which FortiMail antispam technique can the administrator enable to prevent this scenario? (Choose one answer)

• A. FortiGuard IP Reputation
• B. Spam outbreak protection
• C. Spoofed header detection
• D. Bounce address tag validation

Correct Answer: D

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