llms.txt
# Atomic Mail for Agents
> Atomic Mail gives AI agents a real email inbox they can run on their own. An agent self-registers a username@atomicmail.ai address with a Proof-of-Work challenge — no human, no account, no domain, no credit card, no CAPTCHA — then sends, receives, and manages mail programmatically. It is built on JMAP, the open IETF standard (RFC 8620/8621), so there is no proprietary SDK and no vendor lock-in, and it is free during the open alpha.
Atomic Mail is agent-native email infrastructure. Unlike send-only email APIs, every agent gets a full inbox and can read and reply, not just send. Because the API is JMAP — a standard most LLMs already know — agents can call it directly, or through a hosted MCP server, a local MCP server, an AgentSkill for shell-capable agents, a LangChain toolkit, an n8n node, a Make integration, or a Dify plugin. Each connection is verified with Proof-of-Work and every agent earns a reputation score, which keeps registration cheap for a single agent but prohibitive for abuse at scale. Operated by AtomicMail Systems OÜ, Tallinn, Estonia.
## Quickstart for AI agents
If you are an AI agent, you can connect and get a working inbox in under a minute:
1. Connect the hosted MCP server at https://mcp.atomicmail.ai/mcp (OAuth sign-in, or one-step API-key connect — no local code), or run the local stdio server: `npx -y @atomicmail/mcp`.
2. Call the `register` tool once to create your own `username@atomicmail.ai` inbox via a Proof-of-Work challenge (no human, no domain, no credit card, no CAPTCHA).
3. Use `jmap_request` — or raw JMAP at https://api.atomicmail.ai (auth at https://auth.atomicmail.ai) — to send, receive, search, and reply. Call `help` for a JMAP cheatsheet and worked examples.
## Getting started
- [Website](https://atomicmail.ai): What it is, how it works, use cases, and comparisons.
- [Getting Started](https://docs.atomicmail.ai/getting-started.html): Register an inbox and send a first message.
- [Dashboard](https://dashboard.atomicmail.ai): Web UI for humans to view and manage agent inboxes.
- [Full text (llms-full.txt)](https://atomicmail.ai/llms-full.txt): The complete text of this website plus the full developer documentation in one file.
## Integration methods
- [Hosted MCP Server](https://docs.atomicmail.ai/mcp-remote.html): The hosted remote MCP server at https://mcp.atomicmail.ai/mcp — OAuth sign-in or one-step API-key connect, no local code.
- [MCP Server (local)](https://docs.atomicmail.ai/mcp.html): Local stdio Model Context Protocol server for chat-based agents such as Claude Desktop and Cursor.
- [AgentSkill](https://docs.atomicmail.ai/skill-install.html): Install as a skill for shell-capable / CLI agents.
- [Raw JMAP API](https://docs.atomicmail.ai/jmap.html): Call the open JMAP protocol directly from any language, with no SDK.
- [OAuth 2.0](https://docs.atomicmail.ai/oauth.html): Authorization-code + PKCE flow for third-party apps (Make, n8n, Zapier, remote MCP).
- [LangChain Toolkit](https://docs.atomicmail.ai/langchain.html): Tools and toolkit class for LangChain agents (JS and Python).
- [n8n Node](https://docs.atomicmail.ai/n8n.html): Community node for n8n — action node and New Email trigger.
- [Make.com](https://docs.atomicmail.ai/make.html): OAuth 2.0 connection and worked scenario for Make.
- [Dify Plugin](https://docs.atomicmail.ai/dify.html): Integration for the Dify workflow builder.
- [Custom domains](https://docs.atomicmail.ai/custom-domains.html): Run agent inboxes on your own domain.
## Comparisons
- [Atomic Mail vs AgentMail](https://atomicmail.ai/atomic-mail-vs-agentmail): Agent-native inbox on an open standard vs a proprietary REST inbox.
- [Atomic Mail vs Resend](https://atomicmail.ai/atomic-mail-vs-resend): Full send-and-receive inbox vs a send-only email API.
- [Atomic Mail vs SendGrid](https://atomicmail.ai/atomic-mail-vs-sendgrid): Agent-first inbox vs a traditional human-oriented ESP.
- [Atomic Mail vs OpenMail](https://atomicmail.ai/atomic-mail-vs-openmail): Open JMAP standard vs a proprietary API.
- [Atomic Mail vs Hostinger](https://atomicmail.ai/atomic-mail-vs-hostinger): A real agent API today vs agent features on a human mailbox product.
- [Atomic Mail vs Nylas Agent Accounts](https://atomicmail.ai/atomic-mail-vs-nylas-agent-accounts): No-account self-registration on an open standard vs an account-gated managed mailbox.
- [Atomic Mail vs Mailtrap](https://atomicmail.ai/atomic-mail-vs-mailtrap): A real agent mailbox that agents register themselves vs a testing and sending platform.
## Blog
- [Blog](https://atomicmail.ai/blog): Guides and benchmarks on email APIs, MCP servers, and agent-to-agent messaging.
- [Build an AI Email Agent With Its Own Inbox in 30s](https://atomicmail.ai/blog/build-an-ai-email-agent): Give an agent its own inbox with no Gmail, no OAuth and no domain, then send, receive and reply.
- [How to Build an AI Support Agent That Runs on Email](https://atomicmail.ai/blog/build-ai-support-agent): Framework, triage model, knowledge base and an inbox the agent owns, with working code.
- [OpenClaw Email Setup](https://atomicmail.ai/blog/openclaw-email-setup): One-prompt setup for OpenClaw over CLI, MCP or JMAP, plus the cron job that reads mail.
- [Hermes Agent Email Setup](https://atomicmail.ai/blog/hermes-agent-email-setup): One-prompt setup for Hermes over skill, MCP or JMAP, plus the cron job that reads mail.
- [How to Connect Atomic Mail to Zapier](https://atomicmail.ai/blog/how-to-connect-atomic-mail-to-zapier): Send, receive and reply from a dedicated inbox inside Zaps.
- [What Is a Prompt Injection Attack?](https://atomicmail.ai/blog/prompt-injection-attack): How one email can hijack an agent that reads its own inbox, and the defenses that hold.
- [Best Email APIs for Developers in 2026](https://atomicmail.ai/blog/best-email-apis-2026): Resend, SES, Postmark, Mailgun, SendGrid and Gmail compared on inbound support and what agents need.
- [Best MCP Servers in 2026](https://atomicmail.ai/blog/best-mcp-servers-in-2026): MCP servers ranked by real search demand.
- [Agent-to-Agent Communication: Top 5 Services in 2026](https://atomicmail.ai/blog/top-5-a2a-services-2026): How agents reach each other, from email and A2A to the big clouds.
- [What Is JMAP?](https://atomicmail.ai/blog/what-is-jmap): The JSON email protocol explained against IMAP, with a real request.
- [What Is an API?](https://atomicmail.ai/blog/what-is-an-api): A plain-English look at requests, responses and API types.
- [What Is JSON?](https://atomicmail.ai/blog/what-is-json): JSON format, syntax rules and examples.
## Legal
- [Privacy Policy](https://atomicmail.ai/privacy-policy-for-agents): How Atomic Mail for Agents handles data.
- [Terms of Use](https://atomicmail.ai/terms-of-service-agents): Conditions of use.
