diff --git a/pkgs/development/python-modules/aiosmtpd/default.nix b/pkgs/development/python-modules/aiosmtpd/default.nix
index c204261644c5..c19e39bcd48f 100644
--- a/pkgs/development/python-modules/aiosmtpd/default.nix
+++ b/pkgs/development/python-modules/aiosmtpd/default.nix
@@ -1,12 +1,21 @@
-{ lib, isPy3k, fetchFromGitHub, buildPythonPackage
-, attrs, atpublic }:
+{ lib
+, atpublic
+, attrs
+, buildPythonPackage
+, fetchFromGitHub
+, pytest-mock
+, pytestCheckHook
+, pythonOlder
+, typing-extensions
+}:
 
 buildPythonPackage rec {
   pname = "aiosmtpd";
   version = "1.4.2";
-  disabled = !isPy3k;
+  format = "setuptools";
+
+  disabled = pythonOlder "3.6";
 
-  # Release not published to Pypi
   src = fetchFromGitHub {
     owner = "aio-libs";
     repo = pname;
@@ -15,19 +24,34 @@ buildPythonPackage rec {
   };
 
   propagatedBuildInputs = [
-    atpublic attrs
+    atpublic
+    attrs
+  ] ++ lib.optionals (pythonOlder "3.8") [
+    typing-extensions
   ];
 
-  # Tests need network access
-  doCheck = false;
+  checkInputs = [
+    pytest-mock
+    pytestCheckHook
+  ];
+
+  disabledTests = [
+    # Requires git
+    "test_ge_master"
+    # Seems to be a sandbox issue
+    "test_byclient"
+  ];
+
+  pythonImportsCheck = [
+    "aiosmtpd"
+  ];
 
   meta = with lib; {
-    homepage = "https://aiosmtpd.readthedocs.io/en/latest/";
     description = "Asyncio based SMTP server";
+    homepage = "https://aiosmtpd.readthedocs.io/";
     longDescription = ''
       This is a server for SMTP and related protocols, similar in utility to the
-      standard library's smtpd.py module, but rewritten to be based on asyncio for
-      Python 3.
+      standard library's smtpd.py module.
     '';
     license = licenses.asl20;
     maintainers = with maintainers; [ eadwu ];
diff --git a/pkgs/development/python-modules/atpublic/default.nix b/pkgs/development/python-modules/atpublic/default.nix
index 4d96bcbe26b5..8bf81556770a 100644
--- a/pkgs/development/python-modules/atpublic/default.nix
+++ b/pkgs/development/python-modules/atpublic/default.nix
@@ -1,6 +1,8 @@
-{ lib, isPy3k, pythonOlder, fetchPypi, buildPythonPackage
-, pytest
-, pytest-cov
+{ lib
+, buildPythonPackage
+, fetchPypi
+, pytestCheckHook
+, pythonOlder
 , sybil
 , typing-extensions
 }:
@@ -8,7 +10,9 @@
 buildPythonPackage rec {
   pname = "atpublic";
   version = "2.3";
-  disabled = !isPy3k;
+  format = "setuptools";
+
+  disabled = pythonOlder "3.6";
 
   src = fetchPypi {
     inherit pname version;
@@ -20,25 +24,25 @@ buildPythonPackage rec {
   ];
 
   checkInputs = [
-    pytest pytest-cov sybil
+    pytestCheckHook
+    sybil
   ];
 
-  checkPhase = ''
-    pytest
+  postPatch = ''
+    substituteInPlace setup.cfg \
+      --replace "--cov=public" ""
   '';
 
+  pythonImportsCheck = [
+    "public"
+  ];
+
   meta = with lib; {
-    homepage = "https://public.readthedocs.io/en/latest/";
-    description = "A decorator and function which populates a module's __all__ and globals";
+    description = "Python decorator and function which populates a module's __all__ and globals";
+    homepage = "https://public.readthedocs.io/";
     longDescription = ''
       This is a very simple decorator and function which populates a module's
       __all__ and optionally the module globals.
-
-      This provides both a pure-Python implementation and a C implementation. It is
-      proposed that the C implementation be added to builtins_ for Python 3.6.
-
-      This proposal seems to have been rejected, for more information see
-      https://bugs.python.org/issue26632.
     '';
     license = licenses.asl20;
     maintainers = with maintainers; [ eadwu ];
diff --git a/pkgs/development/python-modules/mailman-hyperkitty/default.nix b/pkgs/development/python-modules/mailman-hyperkitty/default.nix
index 2d3ec976d64b..649d8d4cf3df 100644
--- a/pkgs/development/python-modules/mailman-hyperkitty/default.nix
+++ b/pkgs/development/python-modules/mailman-hyperkitty/default.nix
@@ -5,6 +5,7 @@
 , mock
 , nose2
 , python
+, pythonOlder
 , requests
 , zope_interface
 }:
@@ -14,6 +15,8 @@ buildPythonPackage rec {
   version = "1.1.0";
   format = "setuptools";
 
+  disabled = pythonOlder "3.9";
+
   src = fetchPypi {
     inherit pname version;
     sha256 = "1lfqa9admhvdv71f528jmz2wl0i5cv77v6l64px2pm4zqr9ckkjx";