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→Pre-requisites
** all your four VMs have network connectivity to each other via the ens224 network interfaces.
** your VMs have the proper FQDN which can be resolved by your authoritative DNS server(s).
* Install the nmap-ncat, tree, and mailx packages on your host (optinally, install it on your other VMs as well).
* Install postfix if it is not installed.
