PS does it work for SME8?
Well that should be tested but in fact roundcube is in version 0.1 or something like that for centos5 (in epel), and in version 1.0 for centos6....i worry that it won't develop new packages.
What it can be done is to follow each version like I did in the past and build our rpm directly from the tar.gz, but in fact I want to follow the remi's updates and stop to work on security/feature update.
Sme8 is now in maintenance mode, no more features and no more new rpms, the system is really too old if you look about software version