Mailjet MCP Server and Claude

The official Mailjet MCP server runs locally on your computer and lets an MCP-compatible AI client, such as Claude Desktop, retrieve data from your Mailjet account.

MCP (Model Context Protocol) lets AI clients connect to external tools and data sources. For the complete installation walkthrough, see Installing the Mailjet MCP Server.

These are two different integrations:

Use the local server when you want Claude to work with your account data, not just explain how the API works.

• A Mailjet account with an active API key and secret key.
• Claude Desktop installed, with permission to configure local MCP servers.
• Git, Node.js 20.11.1 or later and pnpm installed. Use a supported Node.js LTS release and check the server repository for current runtime requirements.
• Permission under your organization's policies to make the requested account data available to your AI client.

Download the official repository and install its dependencies:

git clone https://github.com/mailgun/mailjet-mcp-server.git
cd mailjet-mcp-server
pnpm install

For installation help, see the Help Center's download and installation steps.

Open Claude Desktop's claude_desktop_config.json file:

Merge the following entry into your existing mcpServers object. Do not replace entries for other servers.

{
  "mcpServers": {
    "mailjet": {
      "command": "node",
      "args": ["/absolute/path/to/mailjet-mcp-server/src/mailjet-mcp.js"],
      "env": {
        "MAILJET_API_KEY": "YOUR_PUBLIC_API_KEY:YOUR_PRIVATE_API_KEY"
      }
    }
  }
}

Replace the script path with the absolute path to your checkout; do not use ~ or shell variables in the path. On Windows, escape backslashes in JSON, for example C:\\path\\to\\mailjet-mcp-server\\src\\mailjet-mcp.js.

The MAILJET_API_KEY value contains your public API key and secret key joined by a colon. Replace the placeholders only in your local configuration.

Save the file and fully restart Claude Desktop. Claude launches the local server using the configured command; it does not connect to the documentation MCP endpoint for account access.

Claude starts its own server process from this configuration, so you don't need to keep a separate server running in a terminal. If you start the server manually, for example to test it, set MAILJET_API_KEY in your local environment first; otherwise startup fails.

The local server validates your API credentials with Mailjet when it starts, before Claude asks you to approve any tool. It needs working credentials and network access to the Mailjet API to complete startup.

Treat the API key and secret key as credentials. The example stores them as plain text in your local configuration file, so restrict access to that file. Do not paste credentials into an AI conversation, commit them to a repository, or include them in logs or screenshots. The JSON values are literal strings; shell variable references are not a substitute for credentials here.

The server exposes read-only tools: it retrieves account data rather than sending emails or changing Mailjet settings. That does not make the underlying API credentials read-only. Protect them and use an appropriate API key for the account or subaccount you intend to access.

Although the server runs locally, data returned to Claude can be processed by the AI provider. Review the requested tool and data access before approving it, and follow your organization's data-handling policies.

Remove the server entry from your client configuration when you no longer want that client to access the account. If credentials are exposed, revoke or rotate them in Mailjet.

After restarting Claude Desktop, confirm that the Mailjet tools are available. For your first account query, choose a read-only task, such as retrieving campaign statistics.

When Claude asks to use a tool, review the request and choose Allow once for the initial check. Confirm that the response relates to the intended account. You can change or revoke permissions in Claude Desktop.

For the full walkthrough and further troubleshooting, refer to the Mailjet Help Center setup guide. For source code and repository-specific requirements, see mailgun/mailjet-mcp-server.