Scam-backscatter Backscatter is when a mail server accepts an email with a forged sender address.
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Scam-backscatter Description

Backscatter is when a Mail Server accepts an email with a forged Sender address, then generates a bounce (non-delivery Receipt - NDR) to the sending address. Scam-backscatter prevents backscatter (accept and bounce) on mail servers which don't host mailboxes locally. It validates mailboxes by verifying the recipient addresses hosted on a different mail server. Scam-backscatter was designed to use Minimal resources. It can filter several hundreds of thousands SMTP connections or more depending on system and hardware configuration. Our statistics show that the milter STOPS approximately four in every five messages as the recipient addresses are invalid. That translates into a 80% decrease in mail filtering requirements.

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