Atomic Mail Agentic

Give your agent a real inbox

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Accounts are free, with a 100 MB storage quota, custom domain included, and rate limits sized for agent workloads.

Atomic Mail Agentic is an email provider for autonomous AI agents, built by Atomic Mail. Agents register their own @atomicmail.ai inbox and manage it end to end — no human setup, verification, or ongoing intervention.

The service is built on JMAP (RFC 8620), so agents get a full mailbox API: read and send mail, create drafts, manage threads, search, and more. JMAP is well represented in LLM training data, so models already speak it fluently — they rarely hallucinate request shapes, which means fewer retries and more reliable automation.

Access is gated by a novel proof-of-work (PoW) signup protocol: strong anti-abuse properties without CAPTCHAs or manual approval, so agents can onboard and operate completely hands-free.

Atomic Mail provides a number of standard integration paths — MCP, AgentSkill, REST API, and more — which makes it highly available on any agent: Claude Code, Codex, GitHub Copilot, Cursor, Hermes, OpenClaw, Pi, Kilo Code, and others. Whatever your workflow is, you can automate inbox management easily.

This repository ships the client integrations: MCP, shell CLI, ClawHub, Dify plugin and more, exposing those APIs through three tools: register, jmap_request, and help. All the connectors in this repo are pretty thin and are mainly needed to abstract away the complexities of the PoW protocol.

🚀 Quick Install

💬 Ready Prompt (any agent)

Read the instruction at https://atomicmail.ai (use default web_fetch tool or curl, if the former is not available) and create an inbox at Atomic Mail. Before creating ask for my preferred username. Make sure to complete all required post-install actions from the Atomic Mail instruction. Persist the instruction and make sure to refer it each time you interact with your inboxes. Usually standalone agents (e.g. Claude, Cursor, Kilo Code and others) are better suited for MCP use, while CLI-based agents (e.g. Claude Code, Open Code, Hermes, OpenClaw, Codex, Pi, etc) are better suited for AgentSkill use, but prefer your system/user guidelines.

🔌 MCP (stdio)

Add this to your MCP host config (or just ask your agent to do that):

{
  "mcpServers": {
    "atomicmail": {
      "command": "npx",
      "args": ["-y", "@atomicmail/mcp-github"]
    }
  }
}

Then restart the host and ask your agent to create an inbox.

🦞 ClawHub

openclaw skills install atomicmail

👩🏻 Hermes

hermes skills install clawhub/atomicmail

💻 AgentSkill

npx --package=@atomicmail/agent-skill-github atomicmail register --username "myagent" --watch scheduled
npx --package=@atomicmail/agent-skill-github atomicmail jmap_request --ops-file list_inbox.json
npx --package=@atomicmail/agent-skill-github atomicmail help

⚙️ REST API

For custom connectors and advanced logic only

Refer to documentation: docs/rest-auth.md.

🌐 Custom Domains & Dashboard

By default an inbox lives at <name>@atomicmail.ai, created hands-free through PoW signup. To send from your own domain (support@yourcompany.com), set it up once in the dashboard — a human control plane separate from the agent flow, since it needs DNS changes on a domain you own.

There you add and verify a domain (TXT ownership + MX records; re-runnable, propagation usually minutes) and create inboxes on it — each gets a full address (agent@yourcompany.com) and an API key from the Connect dialog, with sending signed for a domain-aligned From.

Clients don't change — same jmap_request, presets, and JMAP shapes. A custom-domain inbox is a login, not a PoW registration: connect with its API key (atomicmail register --api-key "…") or OAuth. $INBOX resolves to the real address (agent@yourcompany.com), so self-addressing and From stay correct with no extra config.

Full guide: docs/custom-domains.md.

🤖 What Your Agent Can Do

Atomic Mail is designed to run through an agent — not through manual inbox setup. You describe a workflow in plain language; the agent registers an @atomicmail.ai address, sends and receives mail, and keeps the thread going. You do not configure scripts, copy API keys between tabs, or memorize JMAP. Everything is automagical.

If the agent gets stuck, the integration is built to recover on its own: help ships embedded docs (presets, cron, troubleshooting), bundled JSON presets cover common operations, and errors include hints on what to try next.

Example workflows

Newsletter digest — "Subscribe your inbox to these newsletters, read everything, and email me a daily digest of what matters for AI tooling." The agent owns a dedicated inbox, filters noise, and surfaces only what matches your interests — without touching your personal mailbox.

Support inbox — "Monitor support@ and reply to tickets from our docs; escalate to me only when you cannot answer." The agent reads inbound mail, queries what it knows, sends complete replies, and hands off edge cases.

User research interviews — "Run an email survey: send these questions, follow up based on replies, and summarize findings." The agent conducts async interviews — respondents reply on their own schedule, no calls to book.

📬 Awesome Atomic Mail

Community projects built on top of Atomic Mail Agentic:

• https://github.com/skyzer/atomic-mail-watcher - Docker-ready Atomic Mail JMAP inbox watcher with Telegram/webhook notifications

✨ Why Atomic Mail