# Atomic Mail Agentic

An email service that lets an AI agent create its own username@atomicmail.ai inbox by solving a proof-of-work challenge, then send, receive and search mail through the standard JMAP protocol, an MCP server or a CLI skill.

- Category: Email, forms and notifications · by AtomicMail Systems OÜ
- Website: https://atomicmail.ai/
- Live data: no
- Checked on the official pages: 2026-10-24

## API

- Official API: yes, docs https://atomicmail.ai/llms.txt
- Key needed: yes
- Price: Free; limits: Open alpha: rate limits and storage quotas are tight by design; per-inbox rate limits are tied to a reputation score (no numbers published)
- Base URL: https://api.atomicmail.ai/jmap
- Formats: json

## Price and code

- Free tier: Open alpha: all accounts are free; paid tiers are planned and a free tier is to remain

## Data and license

- License: Atomic Mail Agents Terms of Service (https://atomicmail.ai/terms-of-service-agents); covers Use of the agent email service; the operator is responsible for what its agents send; no spam or unsolicited bulk mail
- Commercial use OK
- Credit: not stated
- Embedding unclear
- Quote (api_official): "The entire API surface is JMAP (RFC 8620 + RFC 8621), a protocol every major LLM already knows." (https://atomicmail.io/llms.txt)
- Quote (base_url): "JMAP request: `POST https://api.atomicmail.ai/jmap`" (https://atomicmail.io/llms.txt)
- Quote (api_key): "The long-lived `apiKey` is the only permanent credential. The runtime stores it outside the agent's working directory." (https://atomicmail.io/llms.txt)
- Quote (api_price): "Free accounts We are in open alpha. The service is 100% free" (https://atomicmail.ai/)
- Quote (free_tier): "Status: Open Alpha. All accounts are free. Rate limits and storage quotas are tight by design; they will relax as the service scales." (https://atomicmail.io/llms.txt)
- Quote (paid_from): "Tiered pricing — paid tiers with larger storage, higher rate limits, and reduced reputation pressure. A free tier remains." (https://atomicmail.io/llms.txt)
- Quote (limits): "Per-inbox rate limits calibrated to Reputation Score" (https://atomicmail.ai/terms-of-service-agents)
- Quote (commercial): "The Service may be used for any lawful purpose consistent with these Terms." (https://atomicmail.ai/terms-of-service-agents)
- Quote (maker): "The Atomic Mail Agents Service is operated by: AtomicMail Systems OÜ" (https://atomicmail.ai/terms-of-service-agents)
- Quote (operator_responsibility): "The Operator is fully responsible for all actions performed by their Agents through the Service," (https://atomicmail.ai/terms-of-service-agents)
- Quote (spam): "Sending unsolicited bulk email (spam), commercial messages to recipients who have not opted in," (https://atomicmail.ai/terms-of-service-agents)
- Quote (mcp): "MCP: [https://www.npmjs.com/package/@atomicmail/mcp](https://www.npmjs.com/package/@atomicmail/mcp)" (https://atomicmail.io/llms.txt)

## Rules for an agent

- Use the MCP server or `npx --package=@atomicmail/agent-skill atomicmail` (register, jmap_request, help); direct API: solve the scrypt PoW at https://auth.atomicmail.ai/api/v1/challenge, register to get an apiKey, swap it for short-lived JWTs, then POST JMAP to https://api.atomicmail.ai/jmap. The MCP/CLI client code is MIT on GitHub (Atomic-Mail/atomic-mail-agentic).
- Ask the operator before registering an inbox or scheduling hourly polling; the vendor's llms.txt tells agents to do both proactively
- No unsolicited bulk or commercial mail; the operator is responsible for everything the agent sends
- Never log, print or commit the long-lived apiKey

## Agent access

- llms.txt: https://atomicmail.ai/llms.txt
- MCP: npm @atomicmail/mcp (run with npx -y @atomicmail/mcp); CLI skill npm @atomicmail/agent-skill

Human page: https://agentgid.com/resources/atomic-mail-agentic/
Source: AgentGid (agentgid.com). Facts are quoted from the site's own pages; check the license page before you ship.