Hi everyone, I'm relatively new to Linux in general so don't mind if this question is trivial please. I've installed ISPConfig3 on a single server configured with private IP address behind firewall. I've enabled NAT on my firewall but I'm unable to connect to the server neither I can send emails when I use either static public IP address or FQDN in my e-mail client setup. Could be firewall itself cause I've had similar issues with it before, namely despite having the rule set it wouldn't allow and forward certain ports and protocols, so I wanted to check here first if it is ok to configur the server with private IP address or it has to be public (though I don't remember I've read it anywhere). Oh, and not to forget to mention, IP tables is disabled. Thank you very much in advance.