Update prerequisite-system.md

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@ -2,7 +2,6 @@ Before you run **mailcow: dockerized**, there are a few requirements that you sh
!!! warning
Do **not** try to install mailcow on a Synology/QNAP device (any NAS), OpenVZ, LXC or other container platforms. KVM, ESX, Hyper-V and other full virtualization platforms are supported.
We **do not** recommend to use CentOS 8 anymore!
!!! info
- mailcow: dockerized requires [some ports](#default-ports) to be open for incoming connections, so make sure that your firewall is not blocking these.