First try to install Stalwart as a mail software

flake.lock

@@ -7,11 +7,11 @@
         "rust-overlay": "rust-overlay"
       },
       "locked": {
-        "lastModified": 1732566399,
-        "narHash": "sha256-l9bczfH/eljCxIEfuZJp6FkOy2J9vndarU1zgZFAzEY=",
+        "lastModified": 1732808289,
+        "narHash": "sha256-1OpXm8b10PBVyh1VIcKI6492tBQ3kocZ7COgxXEQx8E=",
         "ref": "refs/heads/main",
-        "rev": "390e71423300afd8e47a49c8d7ce39150795e8cb",
-        "revCount": 16,
+        "rev": "ab9a6f0d32e2938be57b5f761bab9d04e05d89b5",
+        "revCount": 18,
         "type": "git",
         "url": "https://gitea.mathebau.de/fachschaft/alias_to_sieve"
       },
@@ -180,11 +180,11 @@
     },
     "nixpkgs_3": {
       "locked": {
-        "lastModified": 1732014248,
-        "narHash": "sha256-y/MEyuJ5oBWrWAic/14LaIr/u5E0wRVzyYsouYY3W6w=",
+        "lastModified": 1732521221,
+        "narHash": "sha256-2ThgXBUXAE1oFsVATK1ZX9IjPcS4nKFOAjhPNKuiMn0=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "23e89b7da85c3640bbc2173fe04f4bd114342367",
+        "rev": "4633a7c72337ea8fd23a4f2ba3972865e3ec685d",
         "type": "github"
       },
       "original": {
@@ -251,11 +251,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1732186149,
-        "narHash": "sha256-N9JGWe/T8BC0Tss2Cv30plvZUYoiRmykP7ZdY2on2b0=",
+        "lastModified": 1732575825,
+        "narHash": "sha256-xtt95+c7OUMoqZf4OvA/7AemiH3aVuWHQbErYQoPwFk=",
         "owner": "Mic92",
         "repo": "sops-nix",
-        "rev": "53c853fb1a7e4f25f68805ee25c83d5de18dc699",
+        "rev": "3433ea14fbd9e6671d0ff0dd45ed15ee4c156ffa",
         "type": "github"
       },
       "original": {