Advanced SMTP Tester

A powerful desktop application for testing SMTP configurations with support for multiple providers, dark mode, test history, and enhanced error messages.

Features

🎨 User Interface

• Dark/Light Mode - Toggle between themes with persistence
• Configuration Presets - Quick-load for Office 365, Gmail, SendGrid, Mailgun, Amazon SES
• Test History - Last 50 tests with click-to-load
• Enhanced Errors - Helpful troubleshooting tips for common issues

🖥️ Desktop Application

• Native Windows App - Runs in its own window (no browser needed)
• System Tray - Minimize to tray, quick access
• Menu Bar - Full application menu
• Auto-Start Server - Express server starts automatically

📧 SMTP Testing

• Multiple Encryption - STARTTLS, SSL/TLS, Unencrypted
• Auto-Discovery - Test multiple port/encryption combinations
• Beautiful Emails - Professional HTML test emails
• Detailed Results - Full response logs and error messages

Installation

Desktop App (Windows)

1. Download the latest release from Releases
2. Extract the ZIP file
3. Run Advanced-SMTP-Tester.exe

Web Version

npm install
npm start

Open http://localhost:3000 in your browser.

Electron Development

npm install
npm run electron

Building from Source

Web Version

npm install
npm start

Desktop App

npm install
npm run build

Or use electron-packager:

npx electron-packager . "Advanced-SMTP-Tester" --platform=win32 --arch=x64 --out=dist --overwrite

Usage

Quick Start

1. Select a preset (e.g., "Microsoft Office 365")
2. Enter your credentials
3. Enter recipient email
4. Click "Test Configuration & Send Email"

Configuration Presets

• Office 365: smtp.office365.com:587 (STARTTLS)
• Gmail: smtp.gmail.com:587 (STARTTLS)
• SendGrid: smtp.sendgrid.net:587 (STARTTLS)
• Mailgun: smtp.mailgun.org:587 (STARTTLS)
• Amazon SES: email-smtp.us-east-1.amazonaws.com:587 (STARTTLS)

Auto-Discovery

Click "Auto Discovery Test" to automatically test multiple port/encryption combinations.

Development

Project Structure

Advanced-Smtp-Tester/
├── electron-main.js      # Electron entry point
├── server.js             # Express server
├── index.html            # Main UI
├── public/
│   ├── db.js            # IndexedDB wrapper
│   ├── script.js        # Frontend logic
│   ├── styles.css       # Styling
│   └── Logo.png         # App icon
└── .github/
    └── workflows/
        └── build-desktop.yml  # Automated builds

Scripts

• npm start - Start web server
• npm run electron - Run desktop app
• npm run build - Build Windows installer
• npm run build:dir - Build unpacked directory

Technologies

• Backend: Node.js, Express, Nodemailer
• Frontend: Vanilla JavaScript, IndexedDB
• Desktop: Electron
• Build: electron-builder, electron-packager

License

ISC

Author

Beyond Cloud Technology

Links

• GitHub Repository
• YouTube Channel