Notice: Retirement of Roundcube

Runbox is now focusing on the development of Runbox 7, the fastest webmail app on the planet. Runbox 7 is built for the future, and will provide everything Roundcube does — just better. Try it out now at!

For this reason, and because the Roundcube userbase is small compared to the effort required to maintain it, we will be retiring Roundcube on December 31, 2019.

Please migrate any contact addresses and PGP keys you have stored in Roundcube over to the main Runbox services by this date. You can find more information on these topics here:

Please contact Runbox Support with any questions or concerns.

Thank you for having tested Roundcube.


Runbox is testing Roundcube (a web-based IMAP client) as an additional webmail interface for Runbox email accounts.

The web address for the test installation of Roundcube is not protected from public use, but we would appreciate it if the address you have been given to use this service is not revealed publicly at this time.

Roundcube is provided “as is” with limited support and the following sections of this page are only notes and not a “user guide”. Runbox has not made any commitment to keep Roundcube as an additional webmail interface, or develop Roundcube further.

A Roundcube user manual can be found here:

The following notes are provided as guidance for testers regarding some of the features of Roundcube.

Setting up Roundcube

Log in to Roundcube using your regular Runbox username and password. If your Runbox username includes your own domain name, use the format localpart%domain.tld.

Set-up your email address(es) by going to Settings (gear icon upper right) and choose Identities.

The other settings are self-explanatory and you may set them up as you wish to try out different settings and see what works best for you.


Initially, Roundcube will only display the standard Runbox folders. To display all your folders, click Settings in the upper right corner and then Folders. Select the folders you wish to display by checking their respective checkboxes.

Address Book

The address book can be populated with entries by importing them as vCards or a CSV file. We have modified the CSV file exported from Runbox accounts so that it works for at least First Name, Last Name and Primary Email. Other fields may work but we have not spent much time on this at the moment.

OpenPGP Plugin

We have installed the Roundcube OpenPGP plugin with our installation so that testers can try out the encryption capabilities of Roundcube.


  • Keys that are imported into Roundcube are stored locally in the browser cache on your computer only. This is done for security reasons.
  • As the keys are stored locally they will only be available in the browser and on the machine you import them on.
  • Clearing your browser’s offline files and cache will remove the keys and you will need to import them again.
  • It is possible to import multiple public keys at once, however, we have found that sometimes keys imported this way go missing. We recommend keys are imported one at a time.
  • Importing your private key will require you to enter the key’s passphrase.

Encryption/Signing Functionality

  • The Roundcube PGP plugin can only provide inline PGP support and not PGP/MIME.
  • Attachments are not encrypted, only the text in the compose field is encrypted and/or signed.

The Roundcube developer community is currently working to expand the functionality of the PGP plugin. Meanwhile similar functionality to the Roundcube plugin can be achieved using applications running on your computer such as GPGTools (Mac) and Gpg4win (Windows). Whether the Roundcube functionality offers something that is useful to you depends on your individual needs.