How it works

Connect Mailtrap to Antigravity and send transactional or test emails, inspect sandbox inboxes and messages, and manage templates – all via simple prompts. No coding required, just tell the agent what you need, and Antigravity will execute the API call.

Configuration

Step 1: Add Mailtrap MCP to Antigravity

Open Antigravity, click the three-dotted menu in the upper-right corner of the agent chatbox, select MCP Servers → Manage MCP Servers → View raw config.

Then, paste the Mailtrap MCP snippet into the mcp_config.json file.

{
  "mcpServers": {
    "mailtrap": {
      "command": "npx",
      "args": ["-y", "mcp-mailtrap"],
      "env": {
        "MAILTRAP_API_TOKEN": "your_mailtrap_api_token",
        "DEFAULT_FROM_EMAIL": "your_sender@example.com",
        "MAILTRAP_ACCOUNT_ID": "your_account_id",
        "MAILTRAP_TEST_INBOX_ID": "your_test_inbox_id"
      }
    }
  }
}

Step 2: Insert your Mailtrap credentials

Replace the placeholders in mcp_config.json with your:

• MAILTRAP_API_TOKEN – Required for all operations.
• DEFAULT_FROM_EMAIL – Must match the domain from your Sending Domains.
• MAILTRAP_ACCOUNT_ID – Required for template management.
• MAILTRAP_TEST_INBOX_ID – Required for Sandbox features.

Make sure to refresh the page or restart Antigravity for the changes to take place.

Step 3: Verify the integration

And that’s it! Your Antigravity agent will, from now on, have access to all Mailtrap MCP tools, which you can see on the Manage MCP servers page:

For more information, please consult the official knowledge base article.

Use cases

• Integrate Mailtrap into your project or migrate from another solution.
• Send transactional emails to single or multiple recipients (with CC/BCC).
• Send sandbox emails for safe testing without affecting production.
• Retrieve and search the sandbox inbox messages.
• Create, list, update, and delete email templates.