Software update: Roundcube Webmail 1.4.0

Version 1.4.0 of Roundcube Webmail has been released. The main feature of this php-written email web client is that Ajax technology is used to display the user interface, which gives a modern and smooth impression. Roundcube Webmail has support for shared folders and namespaces, internationalized domain names and smtp-delivery status notifications. In addition, the user interface for imap folders has been modified to provide more space for extensions and plug-ins. Version 1.4.0 includes a new interface, which also works well on smaller screens. The release notes for this release can be found below.

Roundcube 1.4.0 released

We proudly announce the final release of the long awaited major version 1.4 of Roundcube webmail. After more than two years of hard work by Alec and other volunteer contributors, Roundcube finally gets the responsive skin with full mobile device support – the Elastic.

In addition to the new UI we introduce these new features:

  • Email Resent (Bounce) feature
  • Improved Mail envelope integration
  • Support for Redis and Memcached cache
  • Support for SMTPUTF8 and GSSAPI

Plus numerous improvements and bug fixes collected from your precious feedback as well as updates to recent versions of 3rd party libraries like jQuery and TinyMCE.

See the full changelog in the release notes on the Github download page.

The new Elastic theme, which is the new default skin, is built with LESS and of course the sources are included. They allow a certain degree of customization by adjusting some colors and variables using the _styles.less and _variables.less files. Please consider customizing your Roundcube installation in order to make phishing harder. You’ll find guidance in the file inside the skin folder.

This release is considered stable and we encourage you to update your productive installations after carefully testing the upgrade scenario and preparing your users to the significant changes in their webmail UI. Download it from

With the release of Roundcube 1.4.0, the previous stable release branches 1.3.x and 1.2.x will change into LTS low maintenance mode which means they will only receive important security updates but no longer any regular improvement updates. The 1.1.x series is no longer supported and maintained.

Version number 1.4.0
Release status Final
Operating systems Script language
Website Roundcube Webmail
File size


License type GPL