Gmail Sender MCP Server

A Model Context Protocol (MCP) server that enables Claude and other AI assistants to send emails via Gmail API. This focused version only provides email sending capabilities.

Overview

This project creates an MCP server that allows AI assistants to:

• Send new emails
• Reply to existing emails

It's designed to be lightweight and easy to set up, using the Gmail API for email operations.

Prerequisites

• Python 3.8 or higher
• A Google Cloud account with Gmail API enabled
• Docker (optional, for containerized deployment)

Setup Instructions

1. Create a Google Cloud Project and Enable the Gmail API

1. Go to the Google Cloud Console
2. Create a new project or select an existing one
3. In the sidebar, navigate to "APIs & Services" > "Library"
4. Search for "Gmail API" and enable it
5. Go to "APIs & Services" > "Credentials"
6. Click "Create Credentials" and select "OAuth client ID"
7. For application type, choose "Desktop app"
8. Name your OAuth client
9. Click "Create"
10. Download the credentials JSON file

2. Prepare Your Environment

Clone this repository:

git clone https://github.com/abhishekloiwal/gmail-sender-mcp.git
cd gmail-sender-mcp

Install dependencies:

pip install -r requirements.txt

3. Set Up Your Credentials

1. Rename the downloaded credentials file to credentials.json and place it in the project root directory
2. Run the helper script to get a refresh token:

python get_refresh_token.py

3. Follow the authentication flow in your browser
4. Copy the refresh token that appears in the terminal
5. Create a .env file based on the example:

cp .env.example .env

6. Edit the .env file and fill in your credentials:

GMAIL_CLIENT_ID=your-client-id.apps.googleusercontent.com
GMAIL_CLIENT_SECRET=your-client-secret
GMAIL_REFRESH_TOKEN=your-refresh-token
GMAIL_USER_EMAIL=your-email@gmail.com

4. Run the MCP Server

python gmail_sender.py

The server will start and listen for connections.

Docker Deployment

You can also run the server in a Docker container:

Build and Run with Docker

docker build -t gmail-sender-mcp .
docker run -d --name gmail-sender-mcp --env-file .env gmail-sender-mcp

Or Use Docker Compose

docker-compose up -d

Using with Claude or other AI Assistants

To use this MCP server with an AI assistant, you'll need to:

1. Run the MCP server
2. Connect your AI assistant to the MCP server (specific steps depend on your AI platform)

The MCP server provides the following tools:

send_email Tool

Sends a new email.

Parameters:

• to: Recipient email address
• subject: Email subject line
• body: Email body content (HTML formatting supported)

reply_to_email Tool

Replies to an existing email.

Parameters:

• email_id: ID of the email to reply to
• body: Reply content (HTML formatting supported)

Security Considerations

• Keep your .env file secure and never commit it to version control
• The refresh token grants access to send emails from your account, so treat it like a password
• Consider using a dedicated Google account for this integration if you're concerned about security

Troubleshooting

Common issues:

• Authentication errors: Make sure your credentials in the .env file are correct
• Permission errors: Verify that you've enabled the Gmail API in your Google Cloud project
• Token expired: If your refresh token stops working, generate a new one using the helper script

License

MIT

Contributing

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