Resend MCP Server

A complete Model Context Protocol (MCP) server for the Resend API, providing access to all Resend endpoints through Claude Desktop or any MCP-compatible client.

Features

This MCP server implements all Resend API endpoints:

Email Operations

• Send Email - Send single emails with attachments, scheduling, and custom headers
• Send Batch Emails - Send up to 100 emails in a single request
• Get Email - Retrieve email details and status
• Update Email - Modify scheduled emails
• Cancel Email - Cancel scheduled emails

Domain Management

• Create Domain - Add new sending domains
• List Domains - View all configured domains
• Get Domain - Retrieve domain details and DNS records
• Update Domain - Configure tracking and TLS settings
• Delete Domain - Remove domains
• Verify Domain - Trigger domain verification

API Key Management

• Create API Key - Generate new API keys with permissions
• List API Keys - View all API keys
• Delete API Key - Revoke API keys

Contact & Audience Management

• Create Audience - Create contact lists
• List Audiences - View all audiences
• Get/Delete Audience - Manage specific audiences
• Create Contact - Add contacts to audiences
• List Contacts - View audience contacts
• Get/Update/Delete Contact - Manage individual contacts

Broadcast Campaigns

• Create Broadcast - Design email campaigns
• List Broadcasts - View all broadcasts
• Get Broadcast - Retrieve broadcast details
• Update Broadcast - Update broadcast content and settings
• Send Broadcast - Send or schedule broadcasts
• Delete Broadcast - Remove draft broadcasts

Installation

Quick Install via NPX (Recommended)

You can run the Resend MCP server directly without installation:

npx resend-mcp-server --key YOUR_RESEND_API_KEY

Global Installation via NPM

npm install -g resend-mcp-server

Then run:

resend-mcp-server --key YOUR_RESEND_API_KEY

Local Installation

1. Clone the repository:

git clone https://github.com/199-biotechnologies/mcp-send-email.git
cd mcp-send-email

2. Install dependencies:

npm install

3. Build the project:

npm run build

Configuration

Claude Desktop Setup

Add the following to your Claude Desktop configuration file:

Using NPX (Recommended):

{
  "mcpServers": {
    "resend": {
      "command": "npx",
      "args": [
        "resend-mcp-server",
        "--key",
        "YOUR_RESEND_API_KEY"
      ]
    }
  }
}

Using Global Installation:

{
  "mcpServers": {
    "resend": {
      "command": "resend-mcp-server",
      "args": [
        "--key",
        "YOUR_RESEND_API_KEY"
      ]
    }
  }
}

Using Local Installation:

{
  "mcpServers": {
    "resend": {
      "command": "node",
      "args": [
        "/path/to/mcp-send-email/build/index.js",
        "--key",
        "YOUR_RESEND_API_KEY"
      ]
    }
  }
}

Configuration Options

The server accepts the following command-line arguments:

• --key - Your Resend API key (required)
• --sender - Default sender email address (optional)
• --reply-to - Default reply-to email addresses (optional, comma-separated)

You can also use environment variables:

• RESEND_API_KEY - Your Resend API key
• SENDER_EMAIL_ADDRESS - Default sender email
• REPLY_TO_EMAIL_ADDRESSES - Default reply-to addresses (comma-separated)

Finding Your Configuration File

The Claude Desktop configuration file location varies by platform:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json
• Linux: ~/.config/claude/claude_desktop_config.json

Usage Examples

Once configured, you can use natural language to interact with the Resend API through Claude:

Sending Emails

• "Send an email to [email protected] with subject 'Hello' and body 'Test message'"
• "Send a batch of emails to multiple recipients"
• "Schedule an email for tomorrow at 10am"

Managing Domains

• "List all my Resend domains"
• "Add example.com as a new sending domain"
• "Enable click tracking for my domain"

Contact Management

• "Create a new audience called 'Newsletter Subscribers'"
• "Add [email protected] to my newsletter audience"
• "List all contacts in my audience"

API Key Management

• "Create a new API key with sending access only"
• "List all my API keys"

Security Notes

• Never commit your API key to version control
• Use environment variables or secure credential management for production
• The server only exposes functionality through the MCP protocol
• All API operations require valid authentication

Development

Building from Source

# Install dependencies
npm install

# Build TypeScript
npm run build

# Run locally
node build/index.js --key YOUR_API_KEY

Testing

You can test the server using the MCP inspector or by configuring it in Claude Desktop.

Troubleshooting

Common Issues

1. "No API key provided" error

   • Ensure you've set the --key argument or RESEND_API_KEY environment variable

2. Permission errors with NPX

   • Try clearing the NPX cache: npx clear-npx-cache
   • Or install globally: npm install -g resend-mcp-server

3. Server not appearing in Claude

   • Check your configuration file syntax
   • Restart Claude Desktop after configuration changes
   • Verify the path to the executable is correct

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

MIT License - see LICENSE file for details

Support

For issues and feature requests, please use the GitHub issue tracker.

Acknowledgments

Built with:

• Model Context Protocol SDK
• Resend Node.js SDK