Microsoft 365 Mail MCP Server

What the code does

We read the source, 19 h ago · rules 3dff92dd89df

A value the model can set ends up inside a file or shell call. That is not a flaw by itself — for a terminal server it is the job — but it is where things go wrong when it is not.

          fs.writeFileSync(outFd, pdfBuffer);

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

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

claude mcp add mcp-server-microsoft-mail -- npx -y @mindstone/mcp-server-microsoft-mail

{
  "mcpServers": {
    "mcp-server-microsoft-mail": {
      "args": [
        "-y",
        "@mindstone/mcp-server-microsoft-mail"
      ],
      "command": "npx"
    }
  }
}

[mcp_servers.mcp-server-microsoft-mail]
command = "npx"
args = ["-y", "@mindstone/mcp-server-microsoft-mail"]

{
  "mcpServers": {
    "mcp-server-microsoft-mail": {
      "args": [
        "-y",
        "@mindstone/mcp-server-microsoft-mail"
      ],
      "command": "npx"
    }
  }
}

{
  "mcpServers": {
    "mcp-server-microsoft-mail": {
      "args": [
        "-y",
        "@mindstone/mcp-server-microsoft-mail"
      ],
      "command": "npx"
    }
  }
}

This one needs environment variables set before it will start: MS_CLIENT_ID (Microsoft Entra (Azure AD) application client ID), MS_CONFIG_DIR (Path to the per-user Microsoft config directory (credentials/, accounts.json)), MS_ACCOUNT_EMAIL (Account email when running in multi-account per-instance mode (falls back to the first account in accounts.json)), MS_MCP_PACKAGE_ID (Logical package ID surfaced in error responses), MICROSOFT_REQUEST_TIMEOUT_MS (Override the upstream Microsoft Graph request timeout in milliseconds (max 300000 = 5 min)), MCP_WORKSPACE_PATH (Workspace root where download_attachment saves files (falls back to the OS temp directory when unset)). The author declared them in the registry entry; get the values from the project itself.