Email MCP server

Let your AI agent send the email.

MAAC Go Email has a remote MCP server at https://edm.cresclab.com/api/mcp. Connect it to Claude Code, Cursor, VS Code, Windsurf, Claude Desktop or Codex and your agent can send transactional email, manage templates and contacts, send a campaign you already wrote, and read delivery reports and credit — 22 tools, authenticated with your API key. Every account gets a test key at signup, and the free plan includes 100 contacts and 200 emails a month with no credit card.

• Endpoint: https://edm.cresclab.com/api/mcp
• Transport: Streamable HTTP
• Auth: your API key as a Bearer token
• Price: free plan; paid from US$17 a month

Install in your client

Every snippet uses the placeholder sk_test_... — put your own key there. Claude Code, Cursor, VS Code and Windsurf talk to the endpoint directly. Claude Desktop and Codex only start local servers, so they reach it through the open-source mcp-remote bridge, which needs Node.js 18 or later.

• Claude Code
• Cursor
• VS Code
• Windsurf
• Claude Desktop
• Codex

claude mcp add --transport http maacgo-email https://edm.cresclab.com/api/mcp --header "Authorization: Bearer sk_test_..."

{
  "mcpServers": {
    "maacgo-email": {
      "url": "https://edm.cresclab.com/api/mcp",
      "headers": { "Authorization": "Bearer sk_test_..." }
    }
  }
}

{
  "servers": {
    "maacgo-email": {
      "type": "http",
      "url": "https://edm.cresclab.com/api/mcp",
      "headers": { "Authorization": "Bearer ${input:maacgo-email-key}" }
    }
  },
  "inputs": [
    {
      "type": "promptString",
      "id": "maacgo-email-key",
      "description": "MAAC Go Email API key",
      "password": true
    }
  ]
}

{
  "mcpServers": {
    "maacgo-email": {
      "serverUrl": "https://edm.cresclab.com/api/mcp",
      "headers": { "Authorization": "Bearer sk_test_..." }
    }
  }
}

{
  "mcpServers": {
    "maacgo-email": {
      "command": "npx",
      "args": [
        "-y", "mcp-remote", "https://edm.cresclab.com/api/mcp",
        "--header", "Authorization:${MAACGO_AUTH}"
      ],
      "env": { "MAACGO_AUTH": "Bearer sk_test_..." }
    }
  }
}

[mcp_servers.maacgo-email]
command = "npx"
args = ["-y", "mcp-remote", "https://edm.cresclab.com/api/mcp", "--header", "Authorization:${MAACGO_AUTH}"]
env = { MAACGO_AUTH = "Bearer sk_test_..." }

Check that it works

Restart the client or reload its MCP servers, then ask: “Call get_me on maacgo-email.” The answer names your account and its key_mode — test or live. You can also open the endpoint in a browser for a summary without a key.

Tell your agent when to use it

Paste this once into CLAUDE.md, AGENTS.md, your Cursor rules or your client’s custom instructions, so “email the receipt to Ada” goes to this server instead of a hand-written script.

The 22 tools

Every tool calls the public REST API with your key, so the same scopes, allowance, credit and suppression list apply as to a direct curl. There is no privileged path.

Read-only changes nothingWrites changes data in your accountSends email delivers with a live keyDestructive deletes something

Keys and authentication

The header. Send your key as Authorization: Bearer sk_test_... (or sk_live_...). A client that cannot set that header can send x-maacgo-api-key: <key> instead. initialize and tools/list answer without a key, so a client can show the tool list before you add one; every tools/call needs a key.

Test and live keys. The prefix decides. sk_test_ keys only record: send_email returns status: "sent" with test_mode: true, and nothing reaches any inbox or is charged. Every new account starts with a test key. When you want mail to arrive, create an sk_live_ key on the Developers page and swap it in. A live key is issued once the account has a verified sending domain (SPF, DKIM and a return-path MX — three DNS records, free on every plan), credit or a paid plan.

What a key cannot do. Keys are not granted campaigns.write: an agent can send a campaign a person wrote, but cannot create one. A key can never start a payment or issue another key. An unsubscribe, hard bounce or complaint anywhere on the account stops send_email too — campaigns and the API share one suppression list.

Not yet

• An npm package for stdio. @maacgo/email-mcp is built but not published to npm yet. The HTTP endpoint does everything it would; stdio-only clients use mcp-remote as shown above.
• ChatGPT and claude.ai connectors. Not supported yet: both sign in to remote servers with OAuth, and this server takes an API key only.
• Transactional mail from your own domain. API and MCP sends go out from no-reply@edm.cresclab.com with your display name; campaigns can use your verified domain.