RainLoop is a modern, open-source webmail client that allows you to access your existing email accounts through a clean, fast, and intuitive web interface. Unlike services like Gmail or Outlook.com, RainLoop does not provide email hosting itself. Instead, it connects to your current email servers (using protocols like IMAP and SMTP) and provides a beautiful application to read, send, and manage your messages.

Think of it as a stylish desktop application, but running in your web browser. You install it once on your web hosting server, and then you and your users can access all your emails (from multiple accounts and providers) in one place.

Key features and benefits include:

• Lightweight & Fast: Designed for speed with minimal server load.
• Privacy-Focused: It doesn't collect your data; all emails stay on your configured servers.
• Multi-Account Support: Manage several email addresses from different providers seamlessly.
• Modern UI: Offers a responsive, user-friendly interface similar to popular desktop clients.
• Two-Factor Authentication (2FA): Adds an extra layer of security for your login.

For website hosting clients or businesses, RainLoop is an excellent solution to offer branded, professional webmail access (e.g., mail.yourdomain.com) without the complexity and cost of full groupware suites. It's a powerful tool that puts you in control of your email experience, using the infrastructure you already have.