Email Inbox API + Sending by Sendmux MCP Server

What the code does

We read the source, 20 h ago · rules 3dff92dd89df

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

этот файл ставится пользователю, но в репозитории его нет

Found in continuous integration, deployment or infrastructure files, or in a neighbouring package of the same monorepo. None of this is installed when you add the server: it describes how the project is built and released. We list it because a leaked key in a build pipeline is still a real problem, but it is not something this server does on your machine.

      - name: Update Homebrew tap
        if: ${{ contains(needs.release-please.outputs.paths_released, 'packages/ts/cli') }}

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 1 min ago.

claude mcp add sendmux-mcp --transport http https://mcp.sendmux.ai/mcp

{
  "mcpServers": {
    "sendmux-mcp": {
      "url": "https://mcp.sendmux.ai/mcp"
    }
  }
}

[mcp_servers.sendmux-mcp]
url = "https://mcp.sendmux.ai/mcp"

{
  "mcpServers": {
    "sendmux-mcp": {
      "url": "https://mcp.sendmux.ai/mcp"
    }
  }
}

{
  "mcpServers": {
    "sendmux-mcp": {
      "url": "https://mcp.sendmux.ai/mcp"
    }
  }
}

This one needs environment variables set before it will start: SENDMUX_MCP_SURFACES (Tool surfaces to run locally.), SENDMUX_MAILBOX_API_KEY (Mailbox API key for Mailbox API and Sending API tools.), SENDMUX_MANAGEMENT_API_KEY (Root API key for Management API tools.), SENDMUX_SENDING_API_KEY (Optional send-capable smx_mbx_ key or owner-approved smx_agent_ token for Sending API tools when it differs from the Mailbox API key.). The author declared them in the registry entry; get the values from the project itself.

This endpoint answered with an authorization challenge. The server is running, and it signs you in through your browser: there is no API key to paste.

Endpoints