Thunderbird CLI MCP Server

IMAP libraries force you to manage credentials, OAuth flows, and sync state - dangerous in an AI-agent context. Thunderbird already solves all of that. This tool treats Thunderbird as the source of truth and exposes every capability as a CLI command or MCP tool, so AI agents can read, search, and write email without ever touching a password. It runs locally over stdio via the published package.

People connecting email tools to Claude, Cursor, VS Code, or another MCP client. The project is written in JavaScript.

VERIFIED ACTIVE

LAST COMMIT 2026-08-04 · ★ 38 · #21 OF 75 MAINTAINED EMAIL · VERIFIED 2026-08-25

MIT · JavaScript servers · how we verify → /methodology

01 · Install Thunderbird CLI

Claude Code

claude mcp add vitalio-sh-thunderbird-cli -- npx -y thunderbird-cli-mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "vitalio-sh-thunderbird-cli": {
      "command": "npx",
      "args": [
        "-y",
        "thunderbird-cli-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

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

license MIT - declared in the repository

npm package thunderbird-cli-mcp - unscoped; check the name against the project README before installing

registry namespace io.github.vitalio-sh is GitHub-verified and matches the repo owner

03 · What Thunderbird CLI can do

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

Latest releases

v1.0.2 · 2026-04-18

thunderbird-cli v1.0.2 · Install the Thunderbird extension · Download thunderbird_ai_bridge-1.0.2-tb.xpi (signed by Mozilla via addons.thunderbird.net) and install via: · 1. Thunderbird → Add-ons and Themes · 2. ⚙ gear…

v1.0.1 · 2026-04-18

thunderbird-cli v1.0.1 · Install the Thunderbird extension · Download thunderbird_ai_bridge-1.0.1-tb.xpi (signed by Mozilla via addons.thunderbird.net) and install via: · 1. Thunderbird → Add-ons and Themes · 2. ⚙ gear…

v1.0.0 · 2026-04-08

thunderbird-cli v1.0.0 · Install the Thunderbird extension · Download thunderbird_ai_bridge-1.0.0-tb.xpi (signed by Mozilla via addons.thunderbird.net) and install via: · 1. Thunderbird → Add-ons and Themes · 2. ⚙ gear…

04 · Who maintains Thunderbird CLI

thunderbird-cli is maintained by vitalio-sh. It's the only MCP server we track from this author; the repo dates to Apr 2026.

05 · Facts

repository: github.com/vitalio-sh/thunderbird-cli
category: email - ranked #21 of 75 actively-maintained email servers as of 2026-08-25.
registry: io.github.vitalio-sh/thunderbird-cli (active, first published 2026-04-18)
packages: npm:thunderbird-cli-mcp

06 · Thunderbird CLI FAQ

What is Thunderbird CLI?

Is Thunderbird CLI still maintained?

Yes - as of 2026-08-25, its last commit was 2026-08-04. We re-verify nightly.

How do I install Thunderbird CLI?

Run `npx -y thunderbird-cli-mcp`. You can also paste the ready-made client config above.

Does Thunderbird CLI run locally?

Yes - it's a stdio server: it runs on your machine (via npx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Thunderbird CLI

Alternatives to Thunderbird CLI

Maintained email servers if Thunderbird CLI isn't the fit.

More email MCP servers · Proofpoint · Launch Engine - Business Execution OS · Palmyr · Google Workspace (aaronsb) · Gigamail

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