Resend Email MCP server

This MCP server enables LLMs to compose and send emails on your behalf using the Resend API, offering a convenient way to automate email communication through AI assistance.

Installation Options

Using Clinde (Recommended)

The easiest way to use the Resend MCP Server is through the Clinde desktop app:

1. Download and install Clinde
2. Open the Clinde app
3. Navigate to the Servers page
4. Find resend-mcp and click Install

Clinde handles all the installation and configuration automatically.

Using Claude Desktop

To integrate with Claude Desktop, add the following configuration to your claude_desktop_config.json:

{
  "mcpServers": {
    "resend-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "resend-mcp"
      ],
      "env": {
        "RESEND_API_KEY": "YOUR_RESEND_API_KEY_HERE",
        "SENDER_EMAIL_ADDRESS": "YOUR_SENDER_EMAIL_ADDRESS_HERE",
        "REPLY_TO_EMAIL_ADDRESSES": "YOUR_REPLY_TO_EMAIL_ADDRESSES_HERE"
      }
    }
  }
}

Required Configuration

Before using the MCP server, you'll need to set up these environment variables:

• RESEND_API_KEY (required): Your Resend API key
• SENDER_EMAIL_ADDRESS (required): Default email address for sending
• REPLY_TO_EMAIL_ADDRESSES (optional): Comma-separated list of reply-to addresses

Getting a Resend API Key

1. Sign up for a Resend account
2. Generate your API key from the Resend dashboard

Note: Resend offers a free tier with 3,000 emails per month.

Using the Send Email Tool

The MCP server provides a send_email tool with the following parameters:

Required Parameters

• to: Recipient email address
• subject: Email subject line
• content: Plain text email content

Optional Parameters

• from: Custom sender email (defaults to SENDER_EMAIL_ADDRESS)
• replyTo: Array of reply-to addresses (defaults to REPLY_TO_EMAIL_ADDRESSES)
• scheduledAt: Schedule delivery for a future time
• attachments: Array of file attachments

Attachment Configuration

Each attachment requires:

• filename: Name of the attachment file
• Either localPath (path to local file) or remoteUrl (URL to remote file)

Example Usage

When interacting with an LLM like Claude that supports MCP, you can instruct it to send emails for you. For example:

"Please send an email to [email protected] with the subject 'Meeting Reminder' and a brief message about tomorrow's team meeting."

The LLM will use the provided tool to compose and send the email through the Resend API.

How to add this MCP server to Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > MCP and click "Add new global MCP server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "cursor-rules-mcp": {
            "command": "npx",
            "args": [
                "-y",
                "cursor-rules-mcp"
            ]
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explictly ask the agent to use the tool by mentioning the tool name and describing what the function does.