Atomic Mail MCP server
online · 100% uptimeio.github.Atomic-Mail/mcp·v0.3.33·267 starsProgrammable email inbox for AI agents — JMAP, PoW auth, stdio MCP server.
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267 stars585 downloads/wk
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Atomic Mail tools
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How Atomic Mail compares
Against every graded Email MCP server, from our own scans and uptime checks. Updated after each scan run.
- Safety score
- 93/100
- higher than 91% of 916 Email servers
- Uptime
- 100%
- of our recent checks; the typical remote Email server answers 100%
- Response time
- 106 ms
- faster than 84% of 609 Email servers
- GitHub stars
- 267
- more than 95% of 493 Email servers
- Downloads a week
- 585
- more than 87% of 235 Email servers with a package
Release history: 3 versions in the registry since 2026-08-07, latest 2026-11-03, typically one every 46 days.
Install Atomic Mail in Claude Code, Cursor or VS Code
claude mcp add --transport http mcp https://mcp.atomicmail.ai/mcp
What the publisher says
From the Atomic Mail repository's README, as published. We do not edit it. Read it on GitHub
Atomic Mail Agentic
Give your agent a real inbox
Dashboard · Website · Docs · Issues
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.
Shortened. The full README is on GitHub.
Nothing above is checked by us. What we check is on the safety report.
Atomic Mail: common questions
- Is Atomic Mail MCP server safe?
- Yes, by our scan: it is graded A (93/100). Read the Atomic Mail safety report
- How do I install Atomic Mail?
- It runs remotely at mcp.atomicmail.ai. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
- Does Atomic Mail need an API key?
- Yes. The registry entry asks for
ATOMIC_MAIL_API_KEY. - Is Atomic Mail maintained?
- The last commit was 37 days ago (2026-09-27). The latest release is v0.3.33.
- Is Atomic Mail up?
- 100% of our last 28 checks got an answer. We check remote servers about four times a day.
- What can I use instead of Atomic Mail?
- Servers from other publishers that do the same job: Agenticmail MCP server, smbCloud Mail & Auth MCP server and Inbox Zero MCP server. Compare all Atomic Mail alternatives.
- How does Atomic Mail compare with other Email MCP servers?
- safety score 93/100 (higher than 91% of 916 Email servers); uptime 100% (of our recent checks; the typical remote Email server answers 100%); response time 106 ms (faster than 84% of 609 Email servers). Full comparison.
Alternatives to Atomic Mail
Same job from other publishers: the closest match first, then the best rated.
- AgenticmailReal email and SMS for AI agents — send mail, receive verification codes, drive a real inbox.not reviewedEstablishedB
smbCloud Mail & AuthEmail infrastructure and authentication for developers: domains, inbox routes, auth apps, deploys.not reviewedEstablishedA
Inbox ZeroSearch Gmail and Outlook, save drafts, manage email rules, and view email stats.not reviewedEstablishedA- Agent-Native MailAgent-Native Superhuman - email client with keyboard shortcuts and AI triagenot reviewedEstablishedA
- Email Inbox API + Sending by SendmuxAI email inbox and sending tools with attachments, search, live events, and webhooks.not reviewedEstablishedA
