Email, forms and notifications · by AtomicMail Systems OÜ
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.
An agent can get a working two-way mailbox without a human signing up, verifying a domain or entering a card, so sign-up confirmations, replies and agent-to-agent mail can run unattended.
APIFree tierCommercial OKFor your project
- Official API
- Official API · Free Open alpha: rate limits and storage quotas are tight by design; per-inbox rate limits are tied to a reputation score (no numbers published)
“The entire API surface is JMAP (RFC 8620 + RFC 8621), a protocol every major LLM already knows.” atomicmail.io/llms.txt
- Key
- Needed
“The long-lived `apiKey` is the only permanent credential. The runtime stores it outside the agent's working directory.” atomicmail.io/llms.txt
- Formats
- JSON
- Data download
- Not stated
- Price
- Free tier Open alpha: all accounts are free; paid tiers are planned and a free tier is to remain
“Tiered pricing — paid tiers with larger storage, higher rate limits, and reduced reputation pressure. A free tier remains.” atomicmail.io/llms.txt
- License
- Atomic Mail Agents Terms of Service Use of the agent email service; the operator is responsible for what its agents send; no spam or unsolicited bulk mail
- Commercial use
- Commercial use OK
“The Service may be used for any lawful purpose consistent with these Terms.” atomicmail.ai/terms-of-service-agents
- Credit
- Not stated
- Embedding
- Embedding unclear
- Using the website
- Free
Read on Atomic Mail Agentic's own pages on Oct 24, 2026 · license or terms · API docs. Check the license page before you ship.
For your 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
llms.txt: atomicmail.ai/llms.txt · MCP: npm @atomicmail/mcp (run with npx -y @atomicmail/mcp); CLI skill npm @atomicmail/agent-skill
Paste into your agent: Read https://agentgid.com/resources/atomic-mail-agentic/agent.md before using Atomic Mail Agentic.
Quick answers
Does Atomic Mail Agentic have an API?
Yes. Atomic Mail Agentic has an official API documented at https://atomicmail.ai/llms.txt.
Does the Atomic Mail Agentic API need a key?
Yes, you need an API key. 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)
Is Atomic Mail Agentic free?
Yes, there is a free tier: Open alpha: all accounts are free; paid tiers are planned and a free tier is to remain
Can I use Atomic Mail Agentic in a commercial project?
Yes. Its terms say: "The Service may be used for any lawful purpose consistent with these Terms."
What you can build
- A newsletter digest agent that subscribes its own inbox to feeds and mails a daily summary
- An invoice-intake bot that reads supplier emails, parses attachments and flags mismatches
- A human-in-the-loop escalation channel where a pipeline emails its owner and resumes on the reply
Alternatives in Email, forms and notifications
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