Scam-backscatter is a milter that prevents backscatter on mail servers which don't host mailboxes locally. It validates mailboxes by verifying the recipient addresses hosted on a different mail server. License: BSD License (original) Changes: Scam-backscatter now supports multiple backend SMTP servers. The mailertable can be used for the domain and backend SMTP server mappings. The BackSMTPServer setting accepts a hostname or an IP address. Timeouts are configurable. BackSkipVerify skips recipient address verification for connections from specific hosts. Additional logging has been added to diagnose backend SMTP failures.

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