Show HN: Postern, an email system for both humans and agents

Category: infrastructure

Tags: email, self-hosted, cloudflare, mcp, agent-api

Score: 7.3/10 (Innovation: 7, Technical: 8, Documentation: 8, Utility: 6)

Postern is a self-hostable email system on Cloudflare that provides a unified API for both human clients (webmail, IMAP) and AI agents via MCP. Its innovative combination of agent-native communication with traditional email, along with a modular architecture spanning Workers, SMTP relay, and multiple client surfaces, makes it a compelling project for modern mail infrastructure.

Target audience: backend devs, devops, data engineers

Repository: https://github.com/skyphusion-labs/postern · Python · AGPL-3.0

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