Atomic Mail MCP Server

Give your agent a real inbox Dashboard · Website · Docs · Issues 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.

People who work with email, hermes and jmap and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

VERIFIED ACTIVE

LAST COMMIT 2026-09-27 · ★ 264 · #3 OF 98 MAINTAINED EMAIL · VERIFIED 2026-09-30

MIT · TypeScript servers · how we verify → /methodology

01 · Install Atomic Mail

Claude Code

claude mcp add atomic-mail-atomic-mail-agentic --transport http https://mcp.atomicmail.ai/mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "atomic-mail-atomic-mail-agentic": {
      "url": "https://mcp.atomicmail.ai/mcp"
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

https://mcp.atomicmail.ai/mcp

transport: streamable-http

endpoint alive - authentication required · probed 2026-09-30

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions · remote - your agent's requests go to mcp.atomicmail.ai

endpoint auth requires authentication - rejected our unauthenticated MCP initialize

license MIT - declared in the repository

npm package @atomicmail/mcp-modelcontextprotocol - the @atomicmail scope differs from the repo owner (atomic-mail); confirm it's the project's official package

registry namespace io.github.Atomic-Mail is GitHub-verified and matches the repo owner

03 · What Atomic Mail can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Latest releases

v0.3.31 · 2026-09-27

Security · Python clients now JSON-escape $VAR values. In langchain-atomicmail 0.3.30, pydantic-ai-atomicmail 0.3.30 and the Dify plugin, $VAR values were substituted into the JMAP JSON unescaped. reply.json fills…

v0.3.30 · 2026-09-27

Fixed · Sent mail no longer stays a draft in the inbox. The send presets (send_mail.json, send_mail_attachment.json, send_mail_blob_attachment.json, reply.json) now file the sender's copy in Sent and mark it $sent once…

v0.3.29 · 2026-09-23

make skill SKILL.md transform tolerant of the npx package name

04 · Who maintains Atomic Mail

Atomic Mail is maintained by atomic-mail. It's the only MCP server we track from this author; the repo dates to May 2026.

05 · Facts

repository: github.com/atomic-mail/atomic-mail-agentic
website: https://atomicmail.ai/
category: email - ranked #3 of 98 actively-maintained email servers as of 2026-09-30.
release cadence: 8 releases in the last 90 days (latest 2026-09-27)
registry: io.github.Atomic-Mail/mcp (active, first published 2026-06-11 · 22 versions)
packages: npm:@atomicmail/mcp-modelcontextprotocol

06 · Atomic Mail FAQ

What is Atomic Mail?

Is Atomic Mail still maintained?

Yes - as of 2026-09-30, its last commit was 2026-09-27 and it shipped 8 releases in the last 90 days. We re-verify nightly.

How do I install Atomic Mail?

Run `npx -y @atomicmail/mcp-modelcontextprotocol`. You can also paste the ready-made client config above.

Does Atomic Mail require authentication?

Yes - when we probed the endpoint on 2026-09-30, it rejected an unauthenticated MCP initialize; you'll need credentials to connect.

07 · Alternatives to Atomic Mail

Alternatives to Atomic Mail

Maintained email servers if Atomic Mail isn't the fit.

More email MCP servers · Dead Letter · Empty Inbox · Email (IMAP/SMTP) (boutquin) · Company Enrichment API · Fluxmail

More TypeScript MCP servers · ATXP - Agent Payment & Wallet Infrastructure · Ant Feed · Sharedoc MCP · Cmdxray · Dataloupe · see all