Backscatter is typically unwanted messages caused by incoming spam forging email addresses. It is caused when a mail server accepts a forged message that subsequently cannot be delivered, causing the receiving mail system to send a Delivery Service Notification (DSN) to the message Return-Path, which is forged.

This can be avoided by rejecting messages at the border of the MX.

Abusix Mail Intelligence includes a dataset that contains IP addresses of systems that have sent backscatter to our traps, which you can use to filter these messages.

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