Hello Jose, a pleasure to greet you... first of all I want to clarify that I am not an expert in Linux Servers... clarifying this... I tell you that I have contracted a Cloud VPS in www.opencloud.com.ar (attached image of the cloud contracted) and in one of the steps while contracting I must choose the Operating System (OS) of all those that are offered to me, in my case I always choose Centos 8 Stream or Centos 7.4, but I could choose Ubuntu 18.04, Ubuntu 20.04 or Debian 10.. .when I finish choosing/configuring everything they send me an email with the SSH key, so I log in with Putty and make the initial updates available and then install the aaPanel... and I get the following errors... as I understand the architecture of the hosting servers is ARM.
CenOS 7.4 + aaPanel = Error FirewallD Is Not Running
CentOS Stream 8 + aaPanel = Email Server Error (Postfix-Rspamd)
Ubuntu + aaPanel = Email Server Error (Postfix-Rspamd)
Debian + aaPanel = Email Server Error (Postfix-Rspamd)

