✨ [pi4] Added initial Nginx config

hosts/pi4/mailserver.nix

@@ -33,10 +33,14 @@ in
 
     # Use Let's Encrypt certificates. Note that this needs to set up a stripped
     # down nginx and opens port 80.
-    # certificateScheme = "acme-nginx";
+    certificateScheme = "acme-nginx";
   };
-  # security.acme.acceptTerms = true;
-  # security.acme.defaults.email = "security@example.com";
+
+  networking.firewall.allowedTCPPorts = [
+    25
+    465
+    587
+  ];
 
   services.nginx.virtualHosts.${cfg.fqdn}.listen = lib.mkForce [
     {