MCP Google Email Service

A Gmail service implementation using MCP (Model Context Protocol) that provides functionality for sending, receiving, and managing emails through Gmail's API.

Motivation and Context

The MCP Google Email Service was developed to address several key needs in modern application development:

1. Standardized Email Integration: Provides a consistent interface for Gmail integration across different applications, eliminating the need to write boilerplate code for Gmail API interactions.

2. Simplified Authentication: Handles the complexity of Gmail API authentication through multiple methods (Service Account, OAuth 2.0, and Application Default Credentials), making it easier to integrate Gmail functionality into applications.

3. Environment-Based Configuration: Supports flexible configuration through environment variables, making it suitable for various deployment scenarios (development, staging, production).

4. Model Context Protocol (MCP) Integration: Implements the Model Context Protocol, ensuring consistent behavior and integration with other MCP-compliant services. MCP provides a standardized way to handle context and state management across different services.

This service is particularly useful for:

• Applications requiring automated email handling
• Systems needing to integrate Gmail functionality
• Projects requiring a standardized way to interact with Gmail
• Services that need to maintain email communication logs
• Applications requiring real-time email processing
• LLM applications needing email context management

Features

• Email sending and receiving
• Message listing with search capabilities
• Reply to existing messages
• Today's message retrieval
• Multiple authentication methods support
• Environment-based configuration

Installation

pip install mcp-google-email

Usage

from src.server import FastMCP

# Initialize the Gmail service
gmail_service = FastMCP("GMail")

# List unread messages
messages = gmail_service.list_message(query='is:unread', max_results=10)

# Send an email
gmail_service.send_message(
    to='recipient@example.com',
    subject='Test Email',
    message_text='Hello, this is a test email'
)

# Get today's messages
todays_messages = gmail_service.get_todays_messages(max_results=20)

# Reply to a message
gmail_service.reply_to_message(
    message_id='message_id_here',
    reply_text='Thank you for your email'
)

Authentication

The package supports multiple authentication methods:

1. Service Account (via GOOGLE_APPLICATION_CREDENTIALS or GOOGLE_CREDENTIALS_CONFIG)
2. OAuth 2.0 (via credentials.json and token.json)
3. Application Default Credentials (ADC)

Environment Variables

The following environment variables can be used to configure the service:

• GOOGLE_APPLICATION_CREDENTIALS: Path to your service account credentials JSON file
• GOOGLE_CREDENTIALS_CONFIG: JSON string containing service account credentials

Requirements

• Python 3.11+
• google-api-python-client>=2.0.0
• google-auth-httplib2>=0.1.0
• google-auth-oauthlib>=0.4.6
• mcp>=1.0.0
• pydantic>=1.8.0
• python-dotenv>=0.19.0

Development

To set up the development environment:

1. Clone the repository:

git clone https://github.com/yourusername/mcp-google-email.git
cd mcp-google-email

2. Create and activate a virtual environment:

python -m venv .venv
source .venv/bin/activate  # On Windows: .venv\Scripts\activate

3. Install dependencies:

pip install -r requirements.txt

License

MIT License

Contributing

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