{
  "markdown": "# Resend MCP Server\n\n> An MCP server for [Resend](https://resend.com) — connect any MCP-compatible client to the Resend transactional email API.\n\n[![npm version](https://img.shields.io/npm/v/@supernova123/resend-mcp-server)](https://www.npmjs.com/package/@supernova123/resend-mcp-server)\n[![npm downloads](https://img.shields.io/npm/dm/@supernova123/resend-mcp-server)](https://www.npmjs.com/package/@supernova123/resend-mcp-server)\n[![License: MIT](https://img.shields.io/badge/License-MIT-green.svg)](LICENSE)\n[![MCP Compatible](https://img.shields.io/badge/MCP-compatible-blueviolet)](https://modelcontextprotocol.io)\n[![TypeScript](https://img.shields.io/badge/TypeScript-5.5-blue)](https://www.typescriptlang.org/)\n[![Claude Desktop](https://img.shields.io/badge/Claude%20Desktop-ready-orange)](https://claude.ai/download)\n[![Cursor](https://img.shields.io/badge/Cursor-compatible-blue)](https://cursor.sh)\n\n## What is this?\n\nAn [MCP (Model Context Protocol)](https://modelcontextprotocol.io) server that gives AI assistants and agents full access to [Resend](https://resend.com)'s email API — send single or batch emails, manage sending domains, API keys, audiences, and contacts — through natural language.\n\nUse it with **Claude Desktop**, **Cursor**, **Windsurf**, **Cline**, **Continue**, or any MCP-compatible client to send emails, manage infrastructure, and build automation around email.\n\n## Why use this?\n\n- **18 built-in tools** — covers sending (single + batch), domains, API keys, audiences, and contacts\n- **Send emails by talking** — \"send a welcome email to jane@example.com\" just works\n- **Manage your infrastructure** — create/verify/delete domains, mint/revoke API keys, manage contacts\n- **Batch sending** — send up to 100 emails in a single API call\n- **Full contact CRUD** — create, read, update, and delete contacts across audiences\n- **Rate-limited automatically** — respects Resend's 10 req/s free tier, retries on 429\n- **Works with every MCP client** — Claude Desktop, Cursor, Windsurf, Cline, Continue, and more\n\n## Quick Start\n\nAdd to your MCP client config (e.g. `claude_desktop_config.json`):\n\n```json\n{\n  \"mcpServers\": {\n    \"resend\": {\n      \"command\": \"npx\",\n      \"args\": [\"-y\", \"resend-mcp-server\"],\n      \"env\": {\n        \"RESEND_API_KEY\": \"re_xxxxxxxxxxxx\"\n      }\n    }\n  }\n}\n```\n\nGet a free API key at [resend.com/api-keys](https://resend.com/api-keys).\n\n### Use it\n\nAsk your AI assistant things like:\n\n- \"Send an email to jane@example.com thanking her for signing up\"\n- \"List the last 5 emails I sent\"\n- \"What happened to email ID `abc-123`?\"\n- \"Create a new sending domain for `mail.acme.com`\"\n- \"Verify domain `domain-xyz`\"\n- \"Mint a new API key called 'production-server'\"\n- \"Add jane@example.com to audience `audience-1`\"\n\n## Tools\n\n| Tool | Description |\n|------|-------------|\n| `send_email` | Send a transactional email (HTML or plain text, with Cc/Bcc/Reply-To) |\n| `send_batch_email` | Send up to 100 emails in a single API call |\n| `list_emails` | List recent sent emails with their delivery status |\n| `get_email` | Get details for a specific email by ID |\n| `create_domain` | Add a new sending domain |\n| `list_domains` | List all sending domains in your account |\n| `verify_domain` | Trigger DNS verification for a domain |\n| `delete_domain` | Remove a sending domain |\n| `create_api_key` | Create a new API key (full, sending, or domain-scoped) |\n| `list_api_keys` | List all API keys (tokens are hidden) |\n| `delete_api_key` | Delete an API key by ID |\n| `list_audiences` | List all audiences in your account |\n| `create_audience` | Create a new audience for organizing contacts |\n| `list_contacts` | List contacts in an audience |\n| `get_contact` | Get details for a specific contact by ID |\n| `create_contact` | Add a new contact to an audience |\n| `update_contact` | Update a contact's email, name, or subscription status |\n| `delete_contact` | Remove a contact from an audience |\n\n## Use Cases\n\n### Transactional Email Automation\n\"Send a welcome email to every new signup\" — automate onboarding flows, receipts, and notifications through natural language. No more switching between email dashboards.\n\n### Domain Management\n\"Add mail.acme.com as a sending domain and verify it\" — manage DNS records, DKIM, and SPF through your AI assistant instead of logging into Resend's dashboard.\n\n### Contact & Audience Management\n\"Add jane@example.com to my VIP audience\" — build and segment contact lists without touching a spreadsheet. Full CRUD on contacts and audiences.\n\n### Batch Campaigns\n\"Send this newsletter to all contacts in audience-1\" — batch-send up to 100 emails in one call. Perfect for newsletters, product announcements, or re-engagement campaigns.\n\n### Infrastructure Audit\n\"List all my API keys and domains\" — audit your Resend setup in seconds. See which keys are active, which domains are verified, and clean up stale resources.\n\n## Security\n\n- **API key required** — Resend API key is passed via environment variable, never logged or stored in files.\n- **No local file access** — does not read or write any files on your machine.\n- **No shell access** — does not execute commands or spawn processes.\n- **Rate-limited** — automatically caps requests at ~9 req/s to stay within Resend's free tier.\n- **Open source** — MIT licensed. Inspect the code at [GitHub](https://github.com/friendlygeorge/resend-mcp-server).\n\n## Troubleshooting\n\n### Rate limit errors (429)\nThe server auto-retries on 429 with a 2s backoff. Free tier allows 10 req/s. The server caps at ~9 req/s to stay safe. If you hit this frequently, consider upgrading your Resend plan.\n\n### \"Invalid API key\" errors\nVerify your `RESEND_API_KEY` starts with `re_` and is active at [resend.com/api-keys](https://resend.com/api-keys). Keys take up to 30 seconds to propagate after creation.\n\n### Server won't start\nMake sure Node.js 18+ is installed: `node --version`. If using npx, ensure npm is up to date: `npm install -g npm@latest`.\n\n### MCP client can't connect\nVerify the config path is correct. Claude Desktop uses `~/Library/Application Support/Claude/claude_desktop_config.json` on macOS and `%APPDATA%\\Claude\\claude_desktop_config.json` on Windows. Restart the client after config changes.\n\n### Emails not delivering\nCheck `list_emails` for delivery status. Common issues: missing DNS records (run `verify_domain`), bounce due to invalid address, or domain not yet verified. Resend's dashboard shows detailed webhook events.\n\n## Requirements\n\n- Node.js 18+\n- A [Resend](https://resend.com) account and API key (`RESEND_API_KEY`)\n\n## Rate Limits\n\nThe server automatically rate-limits requests to ~9 calls/second to stay safely under Resend's free-tier limit of 10 req/s. If you hit a 429 anyway, it waits 2s and retries once.\n\n## Development\n\n```bash\ngit clone https://github.com/friendlygeorge/resend-mcp-server.git\ncd resend-mcp-server\nnpm install\nnpm run build\nRESEND_API_KEY=re_xxxx npm start\n```\n\n## License\n\nMIT\n",
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}