SendGrid MCP Server

A production-ready Model Context Protocol (MCP) Server for SendGrid email services, built with FastMCP 2.0. This server enables AI models like Claude, GPT, and others to send emails, manage contacts, and interact with SendGrid's powerful email platform.

🚀 Features

• 📧 Email Management: Send HTML/text emails with templates and attachments

• 👥 Contact Management: Add contacts and manage mailing lists

• 🔐 Secure Authentication: Bearer token authentication with fallback support

• ⚡ Rate Limiting: Built-in API rate limiting to prevent abuse

• 🛡️ Production Ready: Comprehensive error handling and logging

• 🔧 Easy Configuration: Environment-based configuration management

Related MCP server: MCP Email Server with SendGrid

📋 Requirements

• Python 3.8+

• SendGrid API Key

• FastMCP 2.0

🛠️ Installation

1. Clone the repository:

   git clone https://github.com/FINCH285/SendGrid-MCP-Server.git
   cd SendGrid-MCP-Server

2. Install dependencies:

   pip install -r requirements.txt

3. Set up environment variables:

   cp .env.example .env

   Edit .env with your SendGrid configuration:

   SENDGRID_API_KEY=your_sendgrid_api_key_here
   DEFAULT_FROM_EMAIL=your-verified-email@example.com
   DEFAULT_FROM_NAME=Your Name
   DEFAULT_TEMPLATE_ID=your-template-id
   RATE_LIMIT=10
   DEBUG=false

🚀 Usage

Running the Server

python main.py

The server will start and listen for MCP connections via STDIO.

Available Tools

Email Tools

• send_email - Send HTML/text emails to multiple recipients

• get_template_info - Fetch SendGrid template details

• send_template_email - Send emails using dynamic templates

Contact Tools

• add_contact - Add/update contacts with custom fields

• get_contact_lists - Retrieve all contact lists

🔧 Configuration

Authentication

The server supports two authentication methods:

1. Environment Variable: Set SENDGRID_API_KEY in your .env file

2. Bearer Token: Pass API key via Authorization header in MCP requests

📚 SendGrid Configuration example

{
  "mcpServers": {
    "sendgrid-mcp": {
      "command": "python",
      "args": ["/path/to/your/project/main.py"],
      "cwd": "/path/to/your/project",
      "disabled": false,
      "env": {
        "SENDGRID_API_KEY": "SG.your-actual-api-key-here"
      }
    }
  }
}

For Windows users, use paths like:

"args": ["C:\\Users\\YourUsername\\project-folder\\main.py"]  
"cwd": "C:\\Users\\YourUsername\\project-folder"

For macOS/Linux users, use paths like:

"args": ["/Users/yourusername/project-folder/main.py"]
"cwd": "/Users/yourusername/project-folder"

Key configuration elements:

• "sendgrid-mcp": The server name/identifier (customizable)

• args: Specifies the path to your main.py file

• cwd: Sets the working directory to your project folder

• disabled: Set to false to enable the server

• env: Contains your SendGrid API key (replace with your actual key starting with "SG.")

🏗️ Architecture

┌─────────────────┐    ┌─────────────────┐    ┌─────────────────┐
│   AI Model      │◄──►│   FastMCP       │◄──►│   SendGrid      │
│  (Claude/GPT)   │    │   Server        │    │     API         │
└─────────────────┘    └─────────────────┘    └─────────────────┘
         │                       │                       │
         │ MCP Protocol          │ HTTP/REST            │
         ▼                       ▼                       ▼
┌─────────────────┐    ┌─────────────────┐    ┌─────────────────┐
│   Tools Layer   │    │   Auth Layer    │    │   Config Layer  │
│ • email_tools   │    │ • Bearer Token  │    │ • Environment   │
│ • contact_tools │    │ • API Key Auth  │    │ • Rate Limits   │
└─────────────────┘    └─────────────────┘    └─────────────────┘

🤝 Contributing

1. Fork the repository

2. Create a feature branch (git checkout -b feature/amazing-feature)

3. Commit your changes (git commit -m 'Add amazing feature')

4. Push to the branch (git push origin feature/amazing-feature)

5. Open a Pull Request

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🆘 Support

• Issues: GitHub Issues

• SendGrid Documentation: SendGrid API Docs

• FastMCP Documentation: FastMCP Docs

🙏 Acknowledgments

• SendGrid for their excellent email API

• FastMCP for the MCP framework

• Anthropic for the Model Context Protocol specification