Postmark MCP Server

How to connect Postmark MCP to Claude Desktop

Add this block to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows), then restart Claude Desktop. Cursor and Codex use a similar schema.

{
  "mcpServers": {
    "postmark": {
      "command": "npx",
      "args": ["-y", "<server-package-name>"],
      "env": {
        "POSTMARK_API_KEY": "your-api-key-here"
      }
    }
  }
}
// Server source: https://github.com/ActiveCampaign/postmark-mcp
// Check the server's README for the exact "command" and required env vars.

Some MCP servers require an API key. Check the source page for setup: github.com/ActiveCampaign/postmark-mcp.

Does Postmark MCP cost extra?

Postmark ships an official MCP server that uses your existing subscription credentials.

• No separate MCP licence to buy. You pay for your Postmark plan, the MCP server queries that account.
• Whether it's gated to a specific tier wasn't extracted automatically — verify the access requirements on the MCP page or pricing docs.

Postmark also publishes a REST API

Postmark publishes an API, but per-tier gating wasn't extracted automatically.

What you can do with Postmark from an AI agent

Three shapes of agent workflow. Pick the row that matches how you actually use Claude / Cursor / Codex day to day.

Limits and gotchas

• Official MCP server — published by Postmark themselves, so it should track product changes.
• Fallback: the REST API works for any flow the MCP server doesn't cover.
• Rate limits: MCP calls count against your underlying Postmark API quota. Burst usage from a curious agent can drain a daily allowance fast.

Postmark MCP & API FAQ