Resend MCP Server

Resend MCP Server

An MCP server for Resend — connect any MCP-compatible client to the Resend transactional email API.

What is this?

An MCP (Model Context Protocol) server that gives AI assistants and agents access to Resend's email API — send transactional emails, manage sending domains, create API keys, and manage audience contacts — through natural language.

Use it with Claude Desktop, Cursor, Windsurf, Cline, Continue, or any MCP-compatible client to send emails, manage infrastructure, and build automation around email.

Why use this?

• 10 built-in tools — covers sending, domains, API keys, and audiences
• Send emails by talking — "send a welcome email to [email protected]" just works
• Manage your infrastructure — create/verify domains, mint API keys, manage contacts
• Rate-limited automatically — respects Resend's 10 req/s free tier, retries on 429
• Works with every MCP client — Claude Desktop, Cursor, Windsurf, Cline, Continue, and more

Tools

Quick Start

1. Get a Resend API key

Sign up at resend.com and grab an API key from resend.com/api-keys.

2. Install

npm install -g resend-mcp-server

Or run directly with npx:

npx -y resend-mcp-server

3. Configure your MCP client

Add to your MCP client config (e.g. claude_desktop_config.json):

{
  "mcpServers": {
    "resend": {
      "command": "npx",
      "args": ["-y", "resend-mcp-server"],
      "env": {
        "RESEND_API_KEY": "re_xxxxxxxxxxxx"
      }
    }
  }
}

Or with global install:

{
  "mcpServers": {
    "resend": {
      "command": "resend-mcp-server",
      "env": {
        "RESEND_API_KEY": "re_xxxxxxxxxxxx"
      }
    }
  }
}

4. Use it

Ask your AI assistant things like:

• "Send an email to [email protected] thanking her for signing up"
• "List the last 5 emails I sent"
• "What happened to email ID abc-123?"
• "Create a new sending domain for mail.acme.com"
• "Verify domain domain-xyz"
• "List all my sending domains"
• "Mint a new API key called 'production-server'"
• "List all my API keys"
• "Add [email protected] to audience audience-1"
• "Show me the contacts in audience audience-1"

Example Output

send_email

✅ Email sent

- ID: `a1b2c3d4-...`

list_emails

📧 Recent Emails (3):

1. Welcome to Acme!
   From: Acme <[email protected]> → To: [email protected]
   ID: `a1b2c3d4-...` | Last Event: delivered | Created: 2026-01-15T10:30:00Z

2. Your receipt
   From: Acme <[email protected]> → To: [email protected]
   ID: `e5f6g7h8-...` | Last Event: opened | Created: 2026-01-15T09:15:00Z

create_domain

✅ Domain created

mail.acme.com
- ID: `domain-xyz-...`
- Status: pending
- Region: us-east-1
- Created: 2026-01-15T10:30:00Z

DNS Records:
- `mail.acme.com` `MX` → `feedback-smtp.us-east-1.amazonses.com`
- `resend._domainkey.mail.acme.com` `TXT` → `v=DKIM1; k=rsa; p=MIGfMA0GCSq...`
- `mail.acme.com` `TXT` → `v=spf1 include:amazonses.com ~all`

Requirements

• Node.js 18+
• A Resend account and API key (RESEND_API_KEY)

Rate Limits

The 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.

API Reference

All endpoints hit https://api.resend.com with a Bearer token. See the Resend docs for full details.

Development

git clone https://github.com/nova/resend-mcp-server.git
cd resend-mcp-server
npm install
npm run build
RESEND_API_KEY=re_xxxx npm start

License

MIT