First try to install Stalwart as a mail software

flake.lock

@@ -7,11 +7,11 @@
         "rust-overlay": "rust-overlay"
       },
       "locked": {
-        "lastModified": 1733169152,
-        "narHash": "sha256-HUJuoOjNdweJ/ZjYrwJ13omhLZrztp+0RTZsFIwRojc=",
+        "lastModified": 1732808289,
+        "narHash": "sha256-1OpXm8b10PBVyh1VIcKI6492tBQ3kocZ7COgxXEQx8E=",
         "ref": "refs/heads/main",
-        "rev": "963c13f80d80dcff748e57061b18b542ba76a463",
-        "revCount": 19,
+        "rev": "ab9a6f0d32e2938be57b5f761bab9d04e05d89b5",
+        "revCount": 18,
         "type": "git",
         "url": "https://gitea.mathebau.de/fachschaft/alias_to_sieve"
       },
@@ -180,11 +180,11 @@
     },
     "nixpkgs_3": {
       "locked": {
-        "lastModified": 1733015953,
-        "narHash": "sha256-t4BBVpwG9B4hLgc6GUBuj3cjU7lP/PJfpTHuSqE+crk=",
+        "lastModified": 1732521221,
+        "narHash": "sha256-2ThgXBUXAE1oFsVATK1ZX9IjPcS4nKFOAjhPNKuiMn0=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "ac35b104800bff9028425fec3b6e8a41de2bbfff",
+        "rev": "4633a7c72337ea8fd23a4f2ba3972865e3ec685d",
         "type": "github"
       },
       "original": {
@@ -251,11 +251,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1733128155,
-        "narHash": "sha256-m6/qwJAJYcidGMEdLqjKzRIjapK4nUfMq7rDCTmZajc=",
+        "lastModified": 1732575825,
+        "narHash": "sha256-xtt95+c7OUMoqZf4OvA/7AemiH3aVuWHQbErYQoPwFk=",
         "owner": "Mic92",
         "repo": "sops-nix",
-        "rev": "c6134b6fff6bda95a1ac872a2a9d5f32e3c37856",
+        "rev": "3433ea14fbd9e6671d0ff0dd45ed15ee4c156ffa",
         "type": "github"
       },
       "original": {