Show HN: Outis – Fight AI spam by sending fake "user unknown" bounce emails

Category: cli-tool

Tags: email, spam-filtering, cli, smtp, privacy

Score: 6.5/10 (Innovation: 7, Technical: 7, Documentation: 8, Utility: 4)

Outis is a Go CLI that sends fake RFC 3464 bounce emails (user unknown) to AI-generated spam, tricking senders into removing the address from their lists. It cleverly handles forwarded emails, multiple domains, and shared suppression lists, but relies on the sender processing the bounce and requires full control of a mail domain to be credible.

Target audience: privacy-conscious developers and sysadmins who control their own email domains

Repository: https://github.com/dtonon/outis · Go · 27 stars

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