SendLayer MCP Server

This MCP server exposes tools for sending email and managing SendLayer webhooks/events using the SendLayer Node.js SDK.

Tools

send-email: Send a message (plain text or HTML), with CC/BCC, reply-to, tags, headers, and attachments.
get-events: Query events with optional filters.
list-webhooks: List registered webhooks.
create-webhook: Create a webhook.
delete-webhook: Delete a webhook by ID.

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.

Built with:

Features

Send plain text and HTML emails
Send emails with attachment
Add CC and BCC recipients
Customizable sender email (requires verification)
Creating and managing webhooks
Viewing email events

Demo

Add video demo

Setup

Currently, you must build the project locally to use this MCP server. Then add the server in Cursor or Claude Desktop to use it in any Cursor or Claude Desktop chat.

Clone this project locally.

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

Build the project

npm install
npm run build

Setup SendLayer

Create a free SendLayer account and Create an API Key. Before sending emails, you'll also need to verify your sending domain.

Connecting the MCP Server to Your LLM

Here's how to connect the MCP server to a client.

Cursor

Open Cursor Settings.

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

Add the MCP server

Select Tools & MCP from the left sidebar and click New MCP server.

Add the following config:

{
  "mcpServers": {
    "sendlayer": {
      "type": "command",
      "command": "node",
      "args": ["ABSOLUTE_PATH_TO_SENDLAYER_MCP_PROJECT/build/index.js",
      "--key=YOUR_SENDLAYER_API_KEY"
      ]
    }
  }
}

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

Supported Arguments

--key: Your SendLayer API key (required)
--sender: Your sender email address from a verified domain (optional)

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

Test the sending

Now you can test out sending emails using the command send an email to recipient@example.com.

You can specify the subject and email content or let the AI model generate one for you.
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).

Note: We've created an example email template in the example.txt file. You can customize it for your specific usecase.

Claude Desktop

Open Claude's Developer config file

Open Claude Desktop settings and navigate to the Developer tab. Click Edit Config and open the file in a code editor.

Add the MCP server

Add the following config:

{
  "mcpServers": {
    "sendlayer": {
      "command": "node",
      "args": [
        "ABSOLUTE_PATH_TO_SENDLAYER_MCP_PROJECT/build/index.js"
      ],
      "env": {
        "SENDLAYER_API_KEY": "YOUR_SENDLAYER_API_KEY",
      }
    }
  }
}

Note: 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

SENDLAYER_API_KEY: Your SendLayer API key (required)
SENDER_EMAIL_ADDRESS: Your sender email address from a verified domain (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.

Test the sending

Restart Claude Desktop. Verify that the sendlayer-mcp tool is available in the Claude developer settings.

Chat with Claude and tell it to send you an email using the sendlayer-mcp tool.

mcp-server