Show HN: Klorn – an email firewall, not another AI assistant (open-source, self)

Category: security

Tags: email-firewall, self-hosted, privacy-focused, inbox-zero, llm-application

Score: 7.0/10 (Innovation: 7, Technical: 7, Documentation: 8, Utility: 6)

Klorn is an open-source email firewall that classifies incoming emails into four tiers (SILENT, QUEUE, PUSH, AUTO) using a deterministic rule engine driven by cheap LLM feature scores, rather than relying on AI suggestions. Its innovative split between perception and decision layers, content-hash integrity checks, and deterministic floor for irreversible actions make it a practical and principled alternative to AI-heavy inbox tools.

Target audience: backend devs, devops, security engineers

Repository: https://github.com/k08200/klorn · TypeScript · AGPL-3.0 · 5 stars

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