Update prerequisite-system.md

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@ -7,10 +7,12 @@ Before you run **mailcow: dockerized**, there are a few requirements that you sh
- mailcow: dockerized requires [some ports](#default-ports) to be open for incoming connections, so make sure that your firewall is not blocking these.
- Make sure that no other application is interfering with mailcow's configuration, such as another mail service
- A correct DNS setup is crucial to every good mailserver setup, so please make sure you got at least the [basics](../prerequisite-dns#the-minimal-dns-configuration) covered before you begin!
- Make sure that your system has a correct date and [time setup](#date-and-time). This is crucial for stuff like two factor TOTP authentication.
- Make sure that your system has a correct date and [time setup](#date-and-time). This is crucial for various components like two factor TOTP authentication.
## Minimum System Resources
**Do not** use OpenVZ or LXC as guests for mailcow.
Please make sure that your system has at least the following resources:
| Resource | mailcow: dockerized |