Email Sending MCP Server 💌

Overview: What is an Email Sending MCP Server?

This simple yet powerful MCP server leverages Resend's API to enable AI applications like Claude Desktop, Continue, and Cursor to send emails directly through a standardized protocol. By integrating with the Model Context Protocol (MCP), it simplifies the process of email composition and delivery, allowing users to focus on their tasks while delegating the communication aspect to technology.

MCP serves as a bridge between AI applications and external tools, making it easier for these applications to access and utilize diverse services seamlessly. For developers, this MVP demonstrates how an MCP server can be built and integrated into AI workflows, enhancing functionality and usability in real-world scenarios.

🔧 Core Features & MCP Capabilities

The Email Sending MCP Server is designed with specific features that enhance its compatibility across different AI clients. It supports the core capabilities of sending emails directly from the AI application, streamlining the user experience by allowing seamless integration without manual intervention.

Compatibility Matrix

MCP Client	Resend
Claude Desktop	✅
Continue	✅
Cursor	❌

While Cursor only allows access to email tools through this server, it is a crucial component in expanding the capabilities of AI applications. The Email Sending MCP Server ensures compatibility and ease-of-use across multiple platforms.

⚙️ MCP Architecture & Protocol Implementation

The architecture of this MCP server involves a few key components:

1. MCP Protocol: The protocol defines how an AI application communicates with the server to send emails.
2. Resend API: This third-party service handles the actual sending of emails, ensuring secure and efficient delivery.

Protocol Flow Diagram

graph TD
    A[AI Application] -->|MCP Client| B[MCP Protocol]
    B --> C[MCP Server]
    C --> D[Resend API]

This diagram illustrates how an AI application uses the MCP client to interact with the protocol, which then communicates with the server. Finally, the Resend API handles the actual sending of emails.

Implementation Details

To integrate this Email Sending MCP Server into your project, follow these steps:

1. Authorization: Set up Resend to send emails from a specific domain or address.
2. Source Code: Clone and edit index.ts to configure email settings per your requirements.
3. Build Process: Run npm install, then npm run build to generate the server script.

AI Workflow Use Cases

Scenario 1: Automated Email Notifications

In a customer service application, an AI bot can use this MCP server to automatically notify users about support tickets or account updates. For example, when a new ticket is created, the bot could send an email using the API provided by Resend.

graph TD
    A[New Ticket Created] --> B[Bot Processes]
    B --> C[Uses Email Sending MCP Server]\n|MCP Client-->|Protocol-->|Server-->|Resend API|
    C --> D[Sends Automated Email to User]

Scenario 2: Bulk Email Campaigns

For marketing campaigns, an AI application can use the server to send emails to multiple recipients. This saves time and reduces errors compared to manual distribution.

graph TD
    A[MKT Team Prepares Campaign] --> B[Imports Recipients into System]
    B --> C[Triggers Email Sending Job Using MCP Client]\n|MCP Client-->|Protocol-->|Server-->|Resend API|
    C --> D[Sends Emails to All Users Simultaneously]

🚀 Getting Started with Installation

To install and set up the Email Sending MCP Server on your local machine:

1. Clone the repository: Use git clone to retrieve the project files.
2. Edit Configuration: Modify index.ts to match your email settings, replacing placeholder values like [email protected].
3. Setup Build Environment: Run npm install, then npm run build. This produces /build/index.js.

Once configured, you can integrate this server into various AI applications.

💡 Key Use Cases in AI Workflows

The Email Sending MCP Server is particularly useful for enhancing the functionality of AI-driven tools by enabling them to send emails automatically. Here are some key use cases:

1. Customer Support Automation: Automating responses to customer inquiries and support tickets.
2. Marketing Campaign Management: Sending out targeted marketing messages at scale without manual intervention.

🔌 Integration with MCP Clients

Adding the Email Sending MCP Server in Cursor

Follow these steps for integration into Cursor:

1. Go to Settings -> MCP Servers
2. Click "Add new MCP server"
3. Set "Name" and "Type" as desired.
4. Define the command: node ABSOLUTE_PATH_TO_INDEX_JS --key=YOUR_RESEND_API_KEY --sender=OPTIONAL_sender_email --reply-to=OPTIONAL_REPLYTO_EMAIL_ADDRESS

Example Configuration

{
  "mcpServers": {
    "emailSendingMCP": {
      "command": "node",
      "args": ["ABSOLUTE_PATH_TO_INDEX_JS"],
      "env": {
        "RESEND_API_KEY": "YOUR_RESEND_API_KEY",
        "SENDER_EMAIL_ADDRESS": "[email protected]",
        "REPLY_TO_EMAIL_ADDRESSES": "[[email protected], [email protected]]"
      }
    }
  }
}

📊 Performance & Compatibility Matrix

The Email Sending MCP Server is designed to work seamlessly with various AI clients and tools. Below is a compatibility matrix:

Client	Resource Access	Tool Usage	Custom Prompts	API Key Support
Claude Desktop	✅	✅	✅	✅
Continue	✅	✅	✅	✅
Cursor	Limited	✔️	❌	-

This matrix shows that both Claude and Continue have full support for all features, while Cursor supports only the email tool.

🛠️ Advanced Configuration & Security

For advanced users, several configuration options are available to fine-tune the behavior of this MCP server:

1. Environment Variables: Set RESEND_API_KEY for secure API key handling.
2. Email Settings: Adjust sender and reply-to addresses as needed.
3. Security: Ensure that any sensitive data is protected and securely managed.

❓ Frequently Asked Questions (FAQ)

1. Why Use an MCP Server?

An MCP server like this one provides a standardized interface for integrating AI applications with external tools, making it easier to manage and scale these integrations.

2. How Does Authorization Work?

Authorizing the Resend service requires setting up API keys for your domain or specific email addresses. Detailed steps can be found in their documentation.

3. Can I Use This Server Without Resend?

No, this server specifically uses Resend to send emails because its features and API are tailored around that service.

4. Is There a Cost Associated with Using Resend?

Resend offers different pricing tiers based on traffic volume. Check their website for current details.

5. How Does This Contribute to the MCP Ecosystem?

The Email Sending MCP Server demonstrates best practices for building and integrating custom MCP solutions, contributing to a broader community of developers and users.

👨‍💻 Development & Contribution Guidelines

Contributions are welcome! If you’d like to contribute or improve this project:

1. Fork the Repository: Start by forking this GitHub repository.
2. Make Your Changes: Edit index.ts as needed, ensuring compliance with the existing structure and functionality.
3. Documentation: Update relevant sections in the README.
4. Testing: Verify the updated server works correctly after your changes.

🌐 MCP Ecosystem & Resources

Explore more about Model Context Protocol at its official documentation. Interact with a community of developers building similar integrations on platforms like Stack Overflow and GitHub issues.

By leveraging this Email Sending MCP Server, you can significantly enhance the capabilities of AI applications by integrating email functionality. Whether you're using Cursor or Continue, this server provides a streamlined way to send emails directly from within your application environment.