diff --git a/authentik.nix b/authentik.nix
index da271f4..45f4e45 100644
--- a/authentik.nix
+++ b/authentik.nix
@@ -1,4 +1,10 @@
-{ config, lib, pkgs, ... }: {
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+{
   users.groups.authentik = { };
   users.users.authentik = {
     isSystemUser = true;
diff --git a/configuration.nix b/configuration.nix
index d446705..fb3c51f 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -1,19 +1,28 @@
-{ config, lib, pkgs, ... }:
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
 
 {
-  imports =
-    [
-      ./hardware-configuration.nix
-      ./authentik.nix
-    ];
+  imports = [
+    ./hardware-configuration.nix
+    ./authentik.nix
+  ];
 
-  security.pam.loginLimits = [{
-    domain = "*";
-    type = "soft";
-    item = "nofile";
-    value = "8192";
-  }];
-  nix.settings.experimental-features = [ "nix-command" "flakes" ];
+  security.pam.loginLimits = [
+    {
+      domain = "*";
+      type = "soft";
+      item = "nofile";
+      value = "8192";
+    }
+  ];
+  nix.settings.experimental-features = [
+    "nix-command"
+    "flakes"
+  ];
   nix.settings.trusted-users = [ "administration" ];
   nix.settings.download-buffer-size = 6710886400;
   # boot.loader.grub.enable = true;
@@ -39,7 +48,10 @@
     }
   ];
   networking.defaultGateway.address = "172.31.1.1";
-  networking.nameservers = [ "9.9.9.9" "1.1.1.1" ];
+  networking.nameservers = [
+    "9.9.9.9"
+    "1.1.1.1"
+  ];
 
   time.timeZone = "Europe/Berlin";
 
@@ -98,7 +110,7 @@
     hyperkitty = {
       enable = true;
     };
-    serve.enable=true;
+    serve.enable = true;
     webHosts = [
       "lists.${config.networking.domain}"
     ];
@@ -118,7 +130,11 @@
   mailserver = {
     enable = true;
     fqdn = "mail.${config.networking.domain}";
-    domains = [ "${config.networking.domain}" "lists.${config.networking.domain}" "mail.${config.networking.domain}" ];
+    domains = [
+      "${config.networking.domain}"
+      "lists.${config.networking.domain}"
+      "mail.${config.networking.domain}"
+    ];
     ldap = {
       enable = true;
       bind = {
@@ -126,11 +142,11 @@
         passwordFile = "/var/lib/dovecot_ldap_passwd";
       };
       dovecot = {
-      	#userFilter = "(&(objectClass=posixAccount)(cn=%u))";
-      	#passFilter = "(&(objectClass=posixAccount)(cn=%u))";
+        #userFilter = "(&(objectClass=posixAccount)(cn=%u))";
+        #passFilter = "(&(objectClass=posixAccount)(cn=%u))";
       };
       postfix = {
-      	#filter = "(&(objectClass=posixUser)(cn=%s))";
+        #filter = "(&(objectClass=posixUser)(cn=%s))";
       };
       searchBase = "dc=auth,dc=htw,dc=stura-dresden,dc=de";
       uris = [
@@ -139,12 +155,12 @@
     };
 
     certificateScheme = "acme-nginx";
-   enableImap = true;
+    enableImap = true;
     enableImapSsl = true;
     enableManageSieve = false;
     enableSubmission = true;
     enableSubmissionSsl = true;
-    extraVirtualAliases = {};
+    extraVirtualAliases = { };
     lmtpSaveToDetailMailbox = "no"; # DOS potential
     mailboxes = {
       Drafts = {
@@ -172,14 +188,17 @@
   services.dovecot2.mailLocation = lib.mkForce "maildir:/var/vmail/%n";
   # services.postfix.relayHost = "141.56.51.14";
 
-
   # virtualisation.docker.enable = true;
   security.acme.acceptTerms = true;
   security.acme.defaults.email = "cert@stura.htw-dresden.de";
 
-  networking.firewall.allowedTCPPorts = [ 25 80 443 597 ];
+  networking.firewall.allowedTCPPorts = [
+    25
+    80
+    443
+    597
+  ];
 
   system.stateVersion = "24.11";
 
 }
-
diff --git a/flake.nix b/flake.nix
index 0cdb51e..6c00a53 100644
--- a/flake.nix
+++ b/flake.nix
@@ -16,10 +16,10 @@
     };
     mailserver = {
       url = "git+https://gitlab.com/simple-nixos-mailserver/nixos-mailserver?ref=nixos-25.05";
-inputs = {
+      inputs = {
         nixpkgs.follows = "nixpkgs";
         nixpkgs-25_05.follows = "nixpkgs";
-    };
+      };
     };
     # mailserver.url = "gitlab:simple-nixos-mailserver/nixos-mailserver/nixos-24.11";
     disko = {
@@ -28,20 +28,28 @@ inputs = {
     };
   };
 
-  outputs = { self, nixpkgs, authentik, mailserver, disko }: {
-    formatter.x86_64-linux = nixpkgs.legacyPackages.x86_64-linux.nixpkgs-fmt;
+  outputs =
+    {
+      self,
+      nixpkgs,
+      authentik,
+      mailserver,
+      disko,
+    }:
+    {
+      formatter.x86_64-linux = nixpkgs.legacyPackages.x86_64-linux.nixfmt-rfc-style;
 
-    nixosConfigurations = {
-      authentik = nixpkgs.lib.nixosSystem {
-        system = "x86_64-linux";
-        modules = [
-          ./configuration.nix
-          ./hetzner-disk.nix
-          disko.nixosModules.disko
-          authentik.nixosModules.default
-          mailserver.nixosModules.mailserver
-        ];
+      nixosConfigurations = {
+        authentik = nixpkgs.lib.nixosSystem {
+          system = "x86_64-linux";
+          modules = [
+            ./configuration.nix
+            ./hetzner-disk.nix
+            disko.nixosModules.disko
+            authentik.nixosModules.default
+            mailserver.nixosModules.mailserver
+          ];
+        };
       };
     };
-  };
 }
diff --git a/hardware-configuration.nix b/hardware-configuration.nix
index 499ea00..b92ae55 100644
--- a/hardware-configuration.nix
+++ b/hardware-configuration.nix
@@ -1,15 +1,27 @@
 # Do not modify this file!  It was generated by ‘nixos-generate-config’
 # and may be overwritten by future invocations.  Please make changes
 # to /etc/nixos/configuration.nix instead.
-{ config, lib, pkgs, modulesPath, ... }:
+{
+  config,
+  lib,
+  pkgs,
+  modulesPath,
+  ...
+}:
 
 {
-  imports =
-    [
-      (modulesPath + "/profiles/qemu-guest.nix")
-    ];
+  imports = [
+    (modulesPath + "/profiles/qemu-guest.nix")
+  ];
 
-  boot.initrd.availableKernelModules = [ "ata_piix" "uhci_hcd" "virtio_pci" "virtio_scsi" "sd_mod" "sr_mod" ];
+  boot.initrd.availableKernelModules = [
+    "ata_piix"
+    "uhci_hcd"
+    "virtio_pci"
+    "virtio_scsi"
+    "sd_mod"
+    "sr_mod"
+  ];
   boot.initrd.kernelModules = [ ];
   boot.kernelModules = [ ];
   boot.extraModulePackages = [ ];