Update prerequisite-system.md

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Before you run **mailcow: dockerized**, there are a few requirements that you should check: Before you run **mailcow: dockerized**, there are a few requirements that you should check:
!!! warning !!! 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. 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.
Do **not** use CentOS 8 with Centos 7 Docker packages. You may create an open relay.
!!! info !!! info
- mailcow: dockerized requires [some ports](#default-ports) to be open for incoming connections, so make sure that your firewall is not blocking these. - mailcow: dockerized requires [some ports](#default-ports) to be open for incoming connections, so make sure that your firewall is not blocking these.