Lemon Email D App

Abstract

1. Introduction

LemonMail DApp is a completely decentralized version of LemonMail, a security-focused email service. Functioning as a stand-alone version of LemonMail, the DApp consist entirely of front-end Javascript code that interacts with an Ethereum contract that serves as a back-end. All message content is end-to-end encrypted and stored on IPFS, a peer-to-peer storage network. The front-end code is open source and also hosted on IPFS (although you are free to deploy and run it anywhere you want). Utilizing decentralized technologies such as Ethereum and IPFS along with public key encryption ensures both platform stability and user privacy. No one can access other users' messages, tamper with the message content or take the service down - not even us!

This is a highly experimental software that aims to demonstrate that it is possible to achieve secure message exchange without trusted third-party. We encourage you to inspect the code and even deploy your own instance of the application and run it wherever you want - locally, on your own server or on IPFS. See below for instructions on how to build and deploy the code. Because we are still at an early testing stage, the Ethereum contract runs on a testnet. You will need a small amount of Kovan Ether in order to use the Dapp - get in touch and we'll be more than happy to send you some!

2. Objective

Lemon dApp is a world's first encrypted & decentralized e-mail service.

This project demonstrates how JavaScript, Ethereum can be applied to a real-world Blockchain & Cloud Computing problem.

4. Technology Stack

5. System Requirements

General requirements for this technology stack — check the README for exact versions.

• Node.js (LTS) and npm
• A modern web browser
• VS Code or any code editor
• Git (to clone the repository)

6. Installation & Setup

git clone https://github.com/DevanaLabs/lemon.email-dApp.git
cd lemon.email-dApp

npm install
npm run production
cp -r public/web/dist/* publicIpfs

ipfs add -r publicIpfs

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Full setup instructions are in the project README.

7. Future Enhancements

Suggested extensions you can add to make this your own project.

• Add a CI/CD pipeline with GitHub Actions
• Deploy to a public test network or cloud free tier
• Add monitoring and cost alerts

8. Viva / Review Questions

Common questions examiners ask for projects in this domain.

1. Why does this problem need a blockchain or cloud-native design?
2. Explain the smart contract / infrastructure components and how they interact.
3. How are gas costs or cloud costs kept under control?
4. How is the system secured (keys, IAM, access control)?
5. How would the solution scale to many more users?

9. Source Code & License

This project is developed by DevanaLabs and published on GitHub under the GNU General Public License v3.0. Please follow the license terms and credit the original author when you use or modify this code.