Hi HN, author here.

AIMX is a self-hosted, open-source mail server for AI agents. MCP over stdio for mailbox and mail management, OS-based auth, mail stored as Markdown on disk. Roughly how I imagine Postfix would look like if it were built for AI agents from scratch.

My AIMX intro blog, with a short 40-second demo GIF: https://uzyn.com/2026/introducing-aimx/

Happy to talk through any of the design decisions.