python312Packages.lmtpd: disable on Python 3.12

smtpd will be removed in Python 3.12

pkgs/development/python-modules/lmtpd/default.nix

@@ -1,20 +1,35 @@
-{ buildPythonPackage, fetchPypi, isPy3k, lib }:
+{ lib
+, buildPythonPackage
+, fetchPypi
+, pythonAtLeast
+, pythonOlder
+, setuptools
+}:
 
 buildPythonPackage rec {
   pname = "lmtpd";
   version = "6.2.0";
-  format = "setuptools";
+  pyproject = true;
 
-  disabled = !isPy3k;
+  # smtpd will be removed in version 3.12
+  disabled = pythonOlder "3.7" || pythonAtLeast "3.12";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "2c6825d2ffa1de099440411a742f58e1b3e8deeb3345adcfd4c2c38d4baf62b3";
+    hash = "sha256-LGgl0v+h3gmUQEEadC9Y4bPo3uszRa3P1MLDjUuvYrM=";
   };
 
+  build-system = [
+    setuptools
+  ];
+
+  pythonImportsCheck = [
+    "lmtpd"
+  ];
+
   meta = with lib; {
-    homepage = "https://github.com/moggers87/lmtpd";
     description = "LMTP counterpart to smtpd in the Python standard library";
+    homepage = "https://github.com/moggers87/lmtpd";
     license = licenses.mit;
     maintainers = with maintainers; [ jluttine ];
   };