RoundCube Webmail is a browser-based multilingual IMAP client with an application-like user interface.
It provides full functionality you expect from an email client, such as MIME support, address book, folder manipulation, message searching and spell checking.
RoundCube Webmail needs a MySQL or PostgresSQL database. The user interface is fully skinnable using XHTML and CSS 2.
This project is meant to be a modern webmail solution which is easy to install / configure. It includes open-source classes/libraries like PEAR and the IMAP wrapper from IlohaMail.
Features include:
- Multilingual capabilities.
- Full support for MIME and HTML messages.
- Compose messages with attachments.
- Multiple sender identities.
- Full featured address book.
- Find-as-you-type address book integration.
- Forwarding messages with attachments.
- Create or remove custom message folders.
- Built-in caching for fast mailbox access.
- Support for external SMTP server.
- Searching messages and contacts.
- Shared folders.
- International domain names.
- Spell checking.
- Advanced user interface.
- Unlimited users and messages.
- Complete customization with skins.
- Extensible using the Plug-in API.
Website: roundcube.net
Support: Forum, GitHub Code Repository
Developer: Thomas Bruederli, Justin Randell, CHuck McNulty, Brett Patterson, till, Bob Johannessen
License: GNU General Public License v3.0

RoundCube is written in PHP. Learn PHP with our recommended free books and free tutorials.
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