It's SOGo packing issue, it's fixed in nightly build, but not in stable release. Try this:
Open file /etc/yum.repos.d/sogo.repo, replace 'rhel-v3' in 'baseurl =' by 'rhel-v3-nightly', then re-execute iRedMail installer.
It's SOGo packing issue, it's fixed in nightly build, but not in stable release. Try this:
Open file /etc/yum.repos.d/sogo.repo, replace 'rhel-v3' in 'baseurl =' by 'rhel-v3-nightly', then re-execute iRedMail installer.