Roundecube webmail is replacing Horde webmail on cPanel & WHM version 108

Roundcube webmail is a free and open-source webmail solution with a desktop-like user interface that is easy to install, Roundcube webmail also runs on a standard LAMPP server.

Web and Cloud

Feb 20, 2023 - 10:31

Jun 24, 2025 - 06:40

Roundcube webmail is a free and open-source webmail solution with a desktop-like user interface that is easy to install, Roundcube webmail also runs on a standard LAMPP server.

Roundecube webmail is replacing Horde webmail on cPanel & WHM version 108

About Roundcube webmail

Roundcube is a free and open-source webmail solution with a desktop-like user interface that is easy to install, Roundcube webmail also runs on a standard LAMPP server. The skins use the latest web standards to render a functional and customizable UI. Roundcube includes other sophisticated open-source libraries such as PEAR, an IMAP library derived from IlohaMail, the TinyMCE rich text editor, Googiespell library for spell checking and the HTML5-PHP sanitizer by Masterminds.

Features

Main Features

Drag-&-drop message management
Full support for MIME and HTML messages
Multiple sender identities
Full featured address book with groups and LDAP connectors
Threaded message listing
IDNA and SMTPUTF8 support
Spell checking
Canned response templates
IMAP folder management
Shared/global IMAP folders
Support for external SMTP server
Support for access control lists (ACL)
Built-in caching for fast mailbox access
Unlimited users and messages
Import/export functions
Template system for custom skins
Plug-in API for flexible extensions

Security

Sophisticated privacy protection
Brute-force login attack prevention
XSS attack protection
Support for PGP encryption
OAuth/XOauth login support

User Interface

Available in over 80 languages
Three column view
Responsive skin (multi-device support)
Light and dark interface modes
Attachment previews
Find-as-you-type address book integration
Searching messages and contacts

3^rd Party Additions

Browse all 3^rd party plugins and skins available on Packagist.

See the development roadmap for more.

Server Requirements

Apache, Lighttpd, Nginx, IIS, Cherokee or Hiawatha web server
PHP Version 7.3 or greater¹
MySQL/MariaDB, PostgreSQL, SQLite, MSSQL or Oracle database
SMTP server and IMAP server with IMAP4 rev1 support

More detailed list of requirements

1. Roundcube supports versions of PHP available at the time of each major release. See the version history for more information.

License

Roundcube Webmail is released under the GNU General Public License version 3 or any later version with exceptions for skins and plugins.

Everyone is welcome to download and use it, deploy it and to re-distribute it. The code is provided «as-is» and in no event shall the copyright owner or contributors be liable for any direct, indirect, incidental, special, exemplary, or consequential damages.

More details about licensing and the exceptions for skins and plug-ins

Services Using and Supporting Roundcube

There are thousands of services that make use of Roundcube to provide webmail to millions of users. We love to see our application in so many hands and believe it is essential for society at large to have Open Source software available for a crucial task such as communication.

Below is a list of services that not only use, but actively contribute to Roundcube and where usage of those services helps to improve and further develop Roundcube webmail. These are the services that make it possible for us to continue improving our software and to make it freely available for everybody. Preferring one of these services will help them to further support us.

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