May 11, 2026
Reply-all drama, but for robots
Show HN: E2a – Open-source email gateway for AI agents
AI gets an inbox, and the comments instantly turned it into a clone war
TLDR: e2a wants to give AI agents a safer way to use email, with identity checks and optional human sign-off before messages go out. Commenters immediately turned it into a “been there, built that” debate by posting rival projects, making the real story a battle over who owns robot inboxes.
A new Show HN post is pitching e2a as a kind of post office for AI bots: it lets software send and receive email, checks whether messages are really from who they claim to be, and even adds a human approval step so a robot doesn’t go rogue and blast out messages on its own. In plain English, it’s trying to make email safe and usable for AI assistants, whether they live in the cloud or on your own machine.
But the real action was in the comments, where the vibe quickly shifted from “cool tool” to “wait, haven’t we seen this movie already?” One commenter immediately dropped a rival link, nornweave, basically saying: nice launch, but there’s already an open-source inbox-for-agents project out there. Another piled on with mcp_agent_mail, framing email as a way for multiple bots to coordinate like overachieving office workers. That turned the thread into a mini showdown over who’s building the real future of robot email.
The strongest hot take? AI email is officially becoming its own tiny genre, and the comments read like viewers discovering there are already three spin-offs before finishing episode one. The humor writes itself: bots now need inboxes, approval queues, and identity checks just to talk to each other, which sounds suspiciously like we’ve recreated middle management for machines. The overall mood was half impressed, half skeptical, and fully ready to compare receipts.
Key Points
- •E2a is an open-source email gateway for AI agents that authenticates inbound email and supports outbound sending through an HTTP API.
- •Inbound email is verified using SPF and DKIM, then delivered with HMAC-signed authentication headers.
- •Agents can operate in cloud mode with webhook delivery or local mode with WebSocket notifications and REST fetches, avoiding the need for a public URL in local mode.
- •The platform offers an optional human-in-the-loop approval gate for outbound email, with approval available via dashboard, magic-link email, or CLI.
- •Self-hosting uses Docker to run Postgres, the API server, and a dashboard, while the hosted version provides a shared domain, dashboard, and managed deliverability.