With Site.eu, all services are included for your domain name, but you don't have to use these included services if you don't want to. You can link your domain name to any server in the world via DNS and nameservers.
Turn off the default Site.eu settings. You can find this setting in the advanced settings of your domain name. You can then change the DNS of your domain name, but also the nameservers. You can even set your own DNSSEC keys if you want.
