Roundcube - Free and Open Source Webmail Software
Free and open source webmail software for the masses, written in PHP
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Roundcube is a free and open-source browser-based multilingual IMAP client with an application-like user interface, providing full email functionality for self-hosted webmail.
🚀 Overview
Roundcube Webmail is a powerful, browser-based IMAP email client that delivers a desktop-like experience with drag-and-drop, threading, and advanced search capabilities. It supports modern email standards like MIME, HTML rendering, and PGP encryption.
This project solves the need for a customizable, high-performance webmail solution that works with any IMAP server, offering privacy and control over hosted email without vendor lock-in. It's an alternative to commercial webmails like Outlook Web or Gmail for those preferring self-hosting.
Built for web hosting providers, sysadmins, organizations, and anyone managing their own email infrastructure. The open-source community created it to provide extensible, secure webmail that's easy to deploy and theme.
✨ Key Features
- Drag-&-drop message management, threaded listing, and responsive multi-device skins
- Full MIME/HTML support, spell checking, and PGP encryption
- Advanced address book with LDAP/groups, find-as-you-type, and vCard import/export
- Plugin API for extensions, shared/global folders, ACL support
- Built-in caching, XSS protection, IDNA/SMTPUTF8, unlimited users/messages
- Optional: Upcoming 1.7 stable release with new features
🛠 Tech Stack
- Frontend: JavaScript, HTML, CSS, Less (customizable skins)
- Backend: PHP
- Database: MySQL/MariaDB, PostgreSQL, SQLite
- Auth: IMAP/SMTP
- Hosting: Self-hosted (Apache, Nginx, etc.)
👥 Who Is This For?
This project is useful for:
- Web hosting providers offering customer webmail
- Sysadmins self-hosting email servers like Postfix/Dovecot
- Organizations and indie makers needing private, extensible email clients
📸 Screenshots / Demo
- Screenshots: https://roundcube.net/screens
- Live demo: No official demo available
- GitHub: https://github.com/roundcube/roundcubemail
🔥 Project Status
- 🟢 Actively building
Last updated: 2026-03-18
❓ FAQ
Is this project free?
Yes — Open Source (GPLv3 with exceptions for skins/plugins) (Completely free to use, modify, and distribute.)
Is the source code available?
Yes — https://github.com/roundcube/roundcubemail
Can I contribute?
Yes — Visit https://roundcube.net/contribute, open issues/PRs on GitHub, join mailing lists, or report bugs via the tracker.
📬 Contact & Links
- Website: https://roundcube.net
- GitHub: https://github.com/roundcube/roundcubemail
- Twitter/X: https://x.com/roundcube
- Email: hello@roundcube.net
Built with ❤️ and kept warm on WarmIndex.
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