diff --git a/pkgs/development/python-modules/mailmanclient/default.nix b/pkgs/development/python-modules/mailmanclient/default.nix
index 9fe9adbe6cfd..e6233de93d12 100644
--- a/pkgs/development/python-modules/mailmanclient/default.nix
+++ b/pkgs/development/python-modules/mailmanclient/default.nix
@@ -1,8 +1,9 @@
-{ stdenv, buildPythonPackage, fetchPypi, six, httplib2, requests }:
+{ stdenv, buildPythonPackage, fetchPypi, isPy3k, six, httplib2, requests }:
 
 buildPythonPackage rec {
   pname = "mailmanclient";
   version = "3.3.0";
+  disabled = !isPy3k;
 
   src = fetchPypi {
     inherit pname version;
diff --git a/pkgs/servers/mail/mailman/default.nix b/pkgs/servers/mail/mailman/default.nix
index 4c5d56341a06..8e763800f650 100644
--- a/pkgs/servers/mail/mailman/default.nix
+++ b/pkgs/servers/mail/mailman/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, buildPythonPackage, fetchPypi, alembic, aiosmtpd, dnspython
+{ stdenv, buildPythonPackage, fetchPypi, isPy3k, alembic, aiosmtpd, dnspython
 , flufl_bounce, flufl_i18n, flufl_lock, lazr_config, lazr_delegates, passlib
 , requests, zope_configuration, click, falcon, importlib-resources
 , zope_component, lynx, postfix, authheaders, gunicorn
@@ -7,6 +7,7 @@
 buildPythonPackage rec {
   pname = "mailman";
   version = "3.3.0";
+  disabled = !isPy3k;
 
   src = fetchPypi {
     inherit pname version;
diff --git a/pkgs/servers/mail/mailman/hyperkitty.nix b/pkgs/servers/mail/mailman/hyperkitty.nix
index 7e696f6d27fa..fedd6c9f7593 100644
--- a/pkgs/servers/mail/mailman/hyperkitty.nix
+++ b/pkgs/servers/mail/mailman/hyperkitty.nix
@@ -1,4 +1,4 @@
-{ stdenv, buildPythonPackage, fetchPypi, isort, coverage, mock
+{ stdenv, buildPythonPackage, fetchPypi, isPy3k, isort, coverage, mock
 , robot-detection, django_extensions, rjsmin, cssmin, django-mailman3
 , django-haystack, flufl_lock, networkx, dateutil, defusedxml
 , django-paintstore, djangorestframework, django, django-q
@@ -8,6 +8,7 @@
 buildPythonPackage rec {
   pname = "HyperKitty";
   version = "1.3.2";
+  disabled = !isPy3k;
 
   src = fetchPypi {
     inherit pname version;
diff --git a/pkgs/servers/mail/mailman/web.nix b/pkgs/servers/mail/mailman/web.nix
index b0ead765a605..ec16775b1d45 100644
--- a/pkgs/servers/mail/mailman/web.nix
+++ b/pkgs/servers/mail/mailman/web.nix
@@ -1,4 +1,4 @@
-{ stdenv, python, hyperkitty, postorius, buildPythonPackage
+{ stdenv, python, hyperkitty, postorius, buildPythonPackage, isPy3k
 , serverEMail ? "postmaster@example.org"
 , archiverKey ? "SecretArchiverAPIKey"
 , allowedHosts ? []
@@ -17,6 +17,7 @@ in
 
 buildPythonPackage {
   name = "mailman-web-0";
+  disabled = !isPy3k;
 
   propagatedBuildInputs = [ hyperkitty postorius ];
 
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index f4110e96f3d4..c14028bae9dd 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -819,11 +819,11 @@ in {
 
   mail-parser = callPackage ../development/python-modules/mail-parser { };
 
-  mailman = disabledIf (!isPy3k) (callPackage ../servers/mail/mailman { });
+  mailman = callPackage ../servers/mail/mailman { };
 
-  mailman-web = disabledIf (!isPy3k) (callPackage ../servers/mail/mailman/web.nix { });
+  mailman-web = callPackage ../servers/mail/mailman/web.nix { };
 
-  mailmanclient = disabledIf (!isPy3k) (callPackage ../development/python-modules/mailmanclient { });
+  mailmanclient = callPackage ../development/python-modules/mailmanclient { };
 
   mailman-hyperkitty = callPackage ../development/python-modules/mailman-hyperkitty { };
 
@@ -3055,7 +3055,7 @@ in {
 
   sunpy = callPackage ../development/python-modules/sunpy { };
 
-  hyperkitty = disabledIf (!isPy3k) (callPackage ../servers/mail/mailman/hyperkitty.nix { });
+  hyperkitty = callPackage ../servers/mail/mailman/hyperkitty.nix { };
 
   robot-detection = callPackage ../development/python-modules/robot-detection {};