diff --git a/checks/rabbi-gerzi-domains.nix b/checks/rabbi-gerzi-domains.nix
new file mode 100644
index 0000000..65ab3fc
--- /dev/null
+++ b/checks/rabbi-gerzi-domains.nix
@@ -0,0 +1,77 @@
+{
+  config,
+  lib,
+  pkgs,
+}:
+
+let
+  frontendConfig = config.services.rabbi-gerzi.frontend;
+  backendConfig = config.services.rabbi-gerzi.backend;
+  frontendVirtualHost =
+    config.services.nginx.virtualHosts.${frontendConfig.hostName};
+  backendVirtualHost =
+    config.services.nginx.virtualHosts.${backendConfig.hostName};
+  redirectVirtualHost = lib.attrByPath [ "www.rabbigerzi.com" ] { }
+    config.services.nginx.virtualHosts;
+
+  assertions = [
+    {
+      assertion = frontendConfig.hostName == "rabbigerzi.com";
+      message = "Rabbi Gerzi frontend does not use the production domain";
+    }
+    {
+      assertion = frontendConfig.apiBaseUrl == "https://api.rabbigerzi.com";
+      message = "Rabbi Gerzi frontend does not use the production API";
+    }
+    {
+      assertion = backendConfig.hostName == "api.rabbigerzi.com";
+      message = "Rabbi Gerzi backend does not use the production API domain";
+    }
+    {
+      assertion = backendConfig.corsAllowedOrigins == [
+        "https://rabbigerzi.com"
+        "https://rabbigerzi.yisroelbaum.com"
+      ];
+      message = "Rabbi Gerzi CORS origins do not cover production and staging";
+    }
+    {
+      assertion = builtins.elem "rabbigerzi.yisroelbaum.com"
+        frontendVirtualHost.serverAliases;
+      message = "Rabbi Gerzi frontend staging alias is missing";
+    }
+    {
+      assertion = builtins.elem "rabbigerziapi.yisroelbaum.com"
+        backendVirtualHost.serverAliases;
+      message = "Rabbi Gerzi backend staging alias is missing";
+    }
+    {
+      assertion = redirectVirtualHost.globalRedirect or null
+        == "rabbigerzi.com";
+      message = "Rabbi Gerzi www host does not redirect to the apex";
+    }
+    {
+      assertion = redirectVirtualHost.forceSSL or false;
+      message = "Rabbi Gerzi www redirect does not force HTTPS";
+    }
+    {
+      assertion = redirectVirtualHost.enableACME or false;
+      message = "Rabbi Gerzi www redirect does not enable ACME";
+    }
+  ];
+
+  failedAssertions = lib.filter (assertion: !assertion.assertion) assertions;
+in
+pkgs.runCommand "rabbi-gerzi-production-domains"
+  {
+    failures = lib.concatMapStringsSep "\n"
+      (assertion: assertion.message) failedAssertions;
+    preferLocalBuild = true;
+  }
+  ''
+    if [ -n "$failures" ]; then
+      printf '%s\n' "$failures" >&2
+      exit 1
+    fi
+
+    touch $out
+  ''
diff --git a/flake.nix b/flake.nix
index 1c9a84d..0506c80 100644
--- a/flake.nix
+++ b/flake.nix
@@ -59,6 +59,12 @@
           }
         ];
       };
+      checks."${system}".rabbi-gerzi-domains =
+        import ./checks/rabbi-gerzi-domains.nix {
+          config = self.nixosConfigurations.nixos.config;
+          inherit (nixpkgs) lib;
+          pkgs = nixpkgs.legacyPackages.${system};
+        };
       devShells."${system}".default =
         let
           pkgs = import nixpkgs { inherit system; };