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What is an MCP Server?

MCP is an open protocol that standardizes how applications provide context to LLMs. Among other benefits, it provides LLMs tools to act on your behalf.

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What can Resend’s MCP Server do?

Currently, Resend’s MCP Server is a simple server you must build locally that can send emails using Resend’s API on your behalf.

  • Send plain text and HTML emails
  • Schedule emails for future delivery
  • Add CC and BCC recipients
  • Configure reply-to addresses
  • Customizable sender email (requires verification)

As an example, you could use this to run local scripts, chat with Claude, or process data and send the results to yourself or your team.

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How to use Resend’s MCP Server

Build the project locally to use this MCP server to use it in a supported MCP client.

1

Clone this project locally.

git clone https://github.com/resend/mcp-send-email.git
2

Build the project

npm install
npm run build
3

Setup Resend

  1. Create an API Key: copy this key to your clipboard
  2. Verify your own domain: to send to email addresses other than your own

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MCP Client Integrations

With the MCP server built, you can now add it to a supported MCP client.

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Cursor

1

Open Cursor Settings

Open the command palette (cmd+shift+p on macOS or ctrl+shift+p on Windows) and choose Cursor Settings.

2

Add the MCP server

Select MCP from the left sidebar and click Add new global MCP server and add the following config:

{
  "mcpServers": {
    "resend": {
      "type": "command",
      "command": "node ABSOLUTE_PATH_TO_MCP_SEND_EMAIL_PROJECT/build/index.js --key=YOUR_RESEND_API_KEY"
    }
  }
}

You can get the absolute path to your build script by right-clicking on the /build/index.js file in Cursor and selecting Copy Path.

Possible arguments

  • --key: Your Resend API key (required)
  • --sender: Your sender email address from a verified domain (optional)
  • --reply-to: Your reply-to email address (optional)

If you don’t provide a sender email address, the MCP server will ask you to provide one each time you call the tool.

Adding the MCP server to Cursor’s global settings will let you send emails from any project on your machine using Cursor’s Agent mode.

3

Test the sending

Test sending emails by going to email.md in the cloned project.

  • Replace the to: email address with your own
  • Select all text in email.md, and press cmd+l
  • Tell cursor to “send this as an email” in the chat (make sure cursor is in Agent mode by selecting “Agent” on lower left side dropdown).

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Claude Desktop

1

Open Claude Desktop settings

Open Claude Desktop settings and navigate to the “Developer” tab. Click Edit Config.

2

Add the MCP server

Add the following config:

{
  "mcpServers": {
    "resend": {
      "command": "node",
      "args": ["ABSOLUTE_PATH_TO_MCP_SEND_EMAIL_PROJECT/build/index.js"],
      "env": {
        "RESEND_API_KEY": "YOUR_RESEND_API_KEY"
      }
    }
  }
}

You can get the absolute path to your build script by right-clicking on the /build/index.js file in your IDE and selecting Copy Path.

Possible environment variables

  • RESEND_API_KEY: Your Resend API key (required)
  • SENDER_EMAIL_ADDRESS: Your sender email address from a verified domain (optional)
  • REPLY_TO_EMAIL_ADDRESS: Your reply-to email address (optional)

If you don’t provide a sender email address, the MCP server will ask you to provide one each time you call the tool.

3

Test the server

Close and reopen Claude Desktop. Verify that the resend tool is available in the Claude developer settings.

Chat with Claude and tell it to send you an email using the resend tool.