Setup mail server and restructure some things

config/hosts/web-public-2/configuration.nix

@@ -0,0 +1,29 @@
+{ ... }:
+{
+  boot.loader.grub = {
+    enable = true;
+    device = "/dev/vda";
+  };
+
+  networking = {    
+    interfaces = {
+      "enp6s18".ipv6.addresses = [{
+        address = "2001:470:5429::96";
+        prefixLength = 64;
+      }];
+    };
+
+    defaultGateway6 = {
+      address = "2001:470:5429::1";
+      interface = "enp6s18";
+    };
+
+    hostName = "web-public-2";
+    firewall = {
+      enable = true;
+      allowedTCPPorts = [ 80 443 5000 8448 ];
+    };
+  };
+
+  system.stateVersion = "23.05";
+}