Add Open-Xchange Repository
Open-Xchange maintains public available software repositories for different platforms, such as RHEL. This repository should be added to the RHEL installation to enable simple installation and updates.
Start a console and create a software repository file for Open-Xchange:
In case there are issues with an username and password containing URL unsafe characters, e.g. an @, they have to be entered URL encoded. Details can be found at https://www.w3schools.com/tags/ref_urlencode.asp