diff --git a/flake.lock b/flake.lock
index 846ad85..133baaf 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,5 +1,25 @@
 {
   "nodes": {
+    "alias-to-sieve": {
+      "inputs": {
+        "flake-parts": "flake-parts",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      },
+      "locked": {
+        "lastModified": 1730993092,
+        "narHash": "sha256-7bXjXmk9SXdyXWno+WqIvn00s9lk9AqO2PfSoooR4QA=",
+        "ref": "refs/heads/main",
+        "rev": "bbdc7c77d516b3369d715590eb27fadba5cc23d6",
+        "revCount": 9,
+        "type": "git",
+        "url": "https://gitea.mathebau.de/fachschaft/alias_to_sieve"
+      },
+      "original": {
+        "type": "git",
+        "url": "https://gitea.mathebau.de/fachschaft/alias_to_sieve"
+      }
+    },
     "blobs": {
       "flake": false,
       "locked": {
@@ -21,11 +41,29 @@
         "nixpkgs-lib": "nixpkgs-lib"
       },
       "locked": {
-        "lastModified": 1727826117,
-        "narHash": "sha256-K5ZLCyfO/Zj9mPFldf3iwS6oZStJcU4tSpiXTMYaaL0=",
+        "lastModified": 1730504689,
+        "narHash": "sha256-hgmguH29K2fvs9szpq2r3pz2/8cJd2LPS+b4tfNFCwE=",
         "owner": "hercules-ci",
         "repo": "flake-parts",
-        "rev": "3d04084d54bedc3d6b8b736c70ef449225c361b1",
+        "rev": "506278e768c2a08bec68eb62932193e341f55c90",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "flake-parts_2": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib_2"
+      },
+      "locked": {
+        "lastModified": 1730504689,
+        "narHash": "sha256-hgmguH29K2fvs9szpq2r3pz2/8cJd2LPS+b4tfNFCwE=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "506278e768c2a08bec68eb62932193e341f55c90",
         "type": "github"
       },
       "original": {
@@ -35,11 +73,11 @@
     },
     "impermanence": {
       "locked": {
-        "lastModified": 1729068498,
-        "narHash": "sha256-C2sGRJl1EmBq0nO98TNd4cbUy20ABSgnHWXLIJQWRFA=",
+        "lastModified": 1731242966,
+        "narHash": "sha256-B3C3JLbGw0FtLSWCjBxU961gLNv+BOOBC6WvstKLYMw=",
         "owner": "nix-community",
         "repo": "impermanence",
-        "rev": "e337457502571b23e449bf42153d7faa10c0a562",
+        "rev": "3ed3f0eaae9fcc0a8331e77e9319c8a4abd8a71a",
         "type": "github"
       },
       "original": {
@@ -71,15 +109,15 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1729665710,
-        "narHash": "sha256-AlcmCXJZPIlO5dmFzV3V2XF6x/OpNWUV8Y/FMPGd8Z4=",
-        "owner": "NixOS",
+        "lastModified": 1730200266,
+        "narHash": "sha256-l253w0XMT8nWHGXuXqyiIC/bMvh1VRszGXgdpQlfhvU=",
+        "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "2768c7d042a37de65bb1b5b3268fc987e534c49d",
+        "rev": "807e9154dcb16384b1b765ebe9cd2bba2ac287fd",
         "type": "github"
       },
       "original": {
-        "owner": "NixOS",
+        "owner": "nixos",
         "ref": "nixos-unstable",
         "repo": "nixpkgs",
         "type": "github"
@@ -102,23 +140,35 @@
     },
     "nixpkgs-lib": {
       "locked": {
-        "lastModified": 1727825735,
-        "narHash": "sha256-0xHYkMkeLVQAMa7gvkddbPqpxph+hDzdu1XdGPJR+Os=",
+        "lastModified": 1730504152,
+        "narHash": "sha256-lXvH/vOfb4aGYyvFmZK/HlsNsr/0CVWlwYvo2rxJk3s=",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/fb192fec7cc7a4c26d51779e9bab07ce6fa5597a.tar.gz"
+        "url": "https://github.com/NixOS/nixpkgs/archive/cc2f28000298e1269cea6612cd06ec9979dd5d7f.tar.gz"
       },
       "original": {
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/fb192fec7cc7a4c26d51779e9bab07ce6fa5597a.tar.gz"
+        "url": "https://github.com/NixOS/nixpkgs/archive/cc2f28000298e1269cea6612cd06ec9979dd5d7f.tar.gz"
+      }
+    },
+    "nixpkgs-lib_2": {
+      "locked": {
+        "lastModified": 1730504152,
+        "narHash": "sha256-lXvH/vOfb4aGYyvFmZK/HlsNsr/0CVWlwYvo2rxJk3s=",
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/cc2f28000298e1269cea6612cd06ec9979dd5d7f.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/cc2f28000298e1269cea6612cd06ec9979dd5d7f.tar.gz"
       }
     },
     "nixpkgs-stable": {
       "locked": {
-        "lastModified": 1729357638,
-        "narHash": "sha256-66RHecx+zohbZwJVEPF7uuwHeqf8rykZTMCTqIrOew4=",
+        "lastModified": 1730602179,
+        "narHash": "sha256-efgLzQAWSzJuCLiCaQUCDu4NudNlHdg2NzGLX5GYaEY=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "bb8c2cf7ea0dd2e18a52746b2c3a5b0c73b93c22",
+        "rev": "3c2f1c4ca372622cb2f9de8016c9a0b1cbd0f37c",
         "type": "github"
       },
       "original": {
@@ -128,6 +178,38 @@
         "type": "github"
       }
     },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1728538411,
+        "narHash": "sha256-f0SBJz1eZ2yOuKUr5CA9BHULGXVSn6miBuUWdTyhUhU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "b69de56fac8c2b6f8fd27f2eca01dcda8e0a4221",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_3": {
+      "locked": {
+        "lastModified": 1730785428,
+        "narHash": "sha256-Zwl8YgTVJTEum+L+0zVAWvXAGbWAuXHax3KzuejaDyo=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "4aa36568d413aca0ea84a1684d2d46f55dbabad7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "pre-commit-hooks": {
       "inputs": {
         "flake-compat": [],
@@ -136,11 +218,11 @@
         "nixpkgs-stable": []
       },
       "locked": {
-        "lastModified": 1729104314,
-        "narHash": "sha256-pZRZsq5oCdJt3upZIU4aslS9XwFJ+/nVtALHIciX/BI=",
+        "lastModified": 1730814269,
+        "narHash": "sha256-fWPHyhYE6xvMI1eGY3pwBTq85wcy1YXqdzTZF+06nOg=",
         "owner": "cachix",
         "repo": "pre-commit-hooks.nix",
-        "rev": "3c3e88f0f544d6bb54329832616af7eb971b6be6",
+        "rev": "d70155fdc00df4628446352fc58adc640cd705c2",
         "type": "github"
       },
       "original": {
@@ -151,14 +233,33 @@
     },
     "root": {
       "inputs": {
-        "flake-parts": "flake-parts",
+        "alias-to-sieve": "alias-to-sieve",
+        "flake-parts": "flake-parts_2",
         "impermanence": "impermanence",
         "nixos-mailserver": "nixos-mailserver",
-        "nixpkgs": "nixpkgs",
+        "nixpkgs": "nixpkgs_3",
         "pre-commit-hooks": "pre-commit-hooks",
         "sops-nix": "sops-nix"
       }
     },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1730601085,
+        "narHash": "sha256-Sgax33jGuvVHTjl1P78IwzlhAGyOxtx5Q26inKja8S4=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "8d1b40f8dfd7539aaa3de56e207e22b3cc451825",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
     "sops-nix": {
       "inputs": {
         "nixpkgs": [
@@ -167,11 +268,11 @@
         "nixpkgs-stable": "nixpkgs-stable"
       },
       "locked": {
-        "lastModified": 1729931925,
-        "narHash": "sha256-3tjYImjVzsSM4sU+wTySF94Yop1spI/XomMBEpljKvQ=",
+        "lastModified": 1731213149,
+        "narHash": "sha256-jR8i6nFLmSmm0cIoeRQ8Q4EBARa3oGaAtEER/OMMxus=",
         "owner": "Mic92",
         "repo": "sops-nix",
-        "rev": "b2211d1a537136cc1d0d5c0af391e8712016b34e",
+        "rev": "f1675e3b0e1e663a4af49be67ecbc9e749f85eb7",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index b4b5593..2e6f161 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,6 +2,9 @@
   description = "Description for the project";
 
   inputs = {
+    alias-to-sieve = {
+      url = "git+https://gitea.mathebau.de/fachschaft/alias_to_sieve";
+    };
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
     nixos-mailserver = {
       url = "git+https://gitlab.com/simple-nixos-mailserver/nixos-mailserver.git";
diff --git a/nixos/machines/kaalut/configuration.nix b/nixos/machines/kaalut/configuration.nix
index 1bbac6f..845a8c4 100644
--- a/nixos/machines/kaalut/configuration.nix
+++ b/nixos/machines/kaalut/configuration.nix
@@ -1,4 +1,4 @@
-{
+{flake-inputs, ...}: {
   imports = [
     ./hardware-configuration.nix
     ../../modules/mail.nix
@@ -8,6 +8,7 @@
   ];
 
   # System configuration here
+  environment.systemPackages = [flake-inputs.alias-to-sieve.packages.x86_64-linux.default];
 
   services.mathebau-mail = {
     enable = true;
diff --git a/nixos/modules/mail.nix b/nixos/modules/mail.nix
index c4d7725..bf04c4d 100644
--- a/nixos/modules/mail.nix
+++ b/nixos/modules/mail.nix
@@ -214,6 +214,7 @@ in {
         RestrictSUIDSGID = true;
       };
     };
+
     # Backups
     services.borgbackup.jobs.mail = {
       paths = [