diff --git a/pkgs/development/python-modules/django-mailman3/default.nix b/pkgs/development/python-modules/django-mailman3/default.nix
new file mode 100644
index 000000000000..bd0f626d54eb
--- /dev/null
+++ b/pkgs/development/python-modules/django-mailman3/default.nix
@@ -0,0 +1,19 @@
+{ stdenv, buildPythonPackage, fetchPypi, django-gravatar2, django_compressor
+, django-allauth, mailmanclient
+}:
+
+buildPythonPackage rec {
+  pname = "django-mailman3";
+  version = "1.2.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0v6c1jhcc212wc2xa314irfcchl05r7nysrcy63dcaan958kmnnx";
+  };
+
+  propagatedBuildInputs = [
+    django-gravatar2 django_compressor django-allauth mailmanclient
+  ];
+
+  doCheck = false;
+}
diff --git a/pkgs/development/python-modules/mailmanclient/default.nix b/pkgs/development/python-modules/mailmanclient/default.nix
new file mode 100644
index 000000000000..a3a807901f3d
--- /dev/null
+++ b/pkgs/development/python-modules/mailmanclient/default.nix
@@ -0,0 +1,13 @@
+{ stdenv, buildPythonPackage, fetchPypi, six, httplib2 }:
+
+buildPythonPackage rec {
+  pname = "mailmanclient";
+  version = "3.2.2";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0xsrzdrsmfhnxv68zwm1g6awk7in08k6yhkyd27ipn0mq1wjm5jd";
+  };
+
+  propagatedBuildInputs = [ six httplib2 ];
+}
diff --git a/pkgs/servers/mail/mailman/default.nix b/pkgs/servers/mail/mailman/core.nix
similarity index 100%
rename from pkgs/servers/mail/mailman/default.nix
rename to pkgs/servers/mail/mailman/core.nix
diff --git a/pkgs/servers/mail/mailman/postorius.nix b/pkgs/servers/mail/mailman/postorius.nix
new file mode 100644
index 000000000000..7ae07a995286
--- /dev/null
+++ b/pkgs/servers/mail/mailman/postorius.nix
@@ -0,0 +1,25 @@
+{ stdenv, buildPythonPackage, fetchPypi, beautifulsoup4, vcrpy, mock
+, django-mailman3, mailmanclient
+}:
+
+buildPythonPackage rec {
+  pname = "postorius";
+  version = "1.2.4";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1722lnscxfl8wdigf5d80d1qmd5gblr439wa989jxlww0wkjg9fl";
+  };
+
+  buildInputs = [ beautifulsoup4 vcrpy mock ];
+  propagatedBuildInputs = [ django-mailman3 ];
+
+  doCheck = false;
+
+  meta = {
+    homepage = https://www.gnu.org/software/mailman/;
+    description = "Web-based user interface for managing GNU Mailman";
+    license = stdenv.lib.licenses.gpl3;
+    maintainers = with stdenv.lib.maintainers; [ peti ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index e77d3aecea25..91a828f3c1d4 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -711,7 +711,9 @@ in {
 
   mail-parser = callPackage ../development/python-modules/mail-parser { };
 
-  mailman = disabledIf (!isPy3k) (callPackage ../servers/mail/mailman { });
+  mailman = disabledIf (!isPy3k) (callPackage ../servers/mail/mailman/core.nix { });
+
+  mailmanclient = callPackage ../development/python-modules/mailmanclient { };
 
   manhole = callPackage ../development/python-modules/manhole { };
 
@@ -821,6 +823,8 @@ in {
 
   poetry = callPackage ../development/python-modules/poetry { };
 
+  postorius = disabledIf (!isPy3k) (callPackage ../servers/mail/mailman/postorius.nix { });
+
   pplpy = callPackage ../development/python-modules/pplpy { };
 
   pprintpp = callPackage ../development/python-modules/pprintpp { };
@@ -2868,6 +2872,8 @@ in {
 
   django-logentry-admin = callPackage ../development/python-modules/django-logentry-admin { };
 
+  django-mailman3 = callPackage ../development/python-modules/django-mailman3 { };
+
   django-pglocks = callPackage ../development/python-modules/django-pglocks { };
 
   django-picklefield = callPackage ../development/python-modules/django-picklefield { };