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GFI MailEssentials 8 bounces spam back to the sender with a false non-delivery report.
The message-expiry feature returns a non-delivery report to the sender when a message cannot be delivered within a specified time.
When an email server rejects a spam message from a forged email address, it generates a non-delivery report (NDR) email notification, also known as a "bounce" message.
the worldwide leader in email and Web security appliances, today announced a new feature in the Barracuda Spam Firewall that can differentiate legitimate Non-Delivery Report (NDR) messages - also known as bounce messages - from invalid NDR messages resulting from spoofing attacks.

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