diff --git a/playbooks/roles/mailman3/files/web-settings.py b/playbooks/roles/mailman3/files/web-settings.py
index 23f47c1226..88397b323c 100644
--- a/playbooks/roles/mailman3/files/web-settings.py
+++ b/playbooks/roles/mailman3/files/web-settings.py
@@ -1,8 +1,9 @@
+# -*- coding: utf-8 -*-
+#
 # This file has been copied from:
-#  https://github.com/maxking/docker-mailman/blob/2693386453ff3865b7c106c6aa456b683bd3bf08/web/mailman-web/settings.py
+#  https://github.com/maxking/docker-mailman/blob/57a2f54/web/mailman-web/settings.py
 # In order to override the ALLOWED_HOSTS and SITE_ID settings.
 #
-# -*- coding: utf-8 -*-
 # Copyright (C) 1998-2016 by the Free Software Foundation, Inc.
 #
 # This file is part of Mailman Suite.
@@ -54,24 +55,12 @@ SITE_ID = 0
 # See https://docs.djangoproject.com/en/3.1/ref/settings/#allowed-hosts
 ALLOWED_HOSTS = [
     "localhost",  # Archiving API from Mailman, keep it.
-    "127.0.0.1",  # Archiving API from Mailman, keep it. OpenDev edit
-    # "lists.your-domain.org",
-    # Add here all production URLs you may have.
-    # The next two entries are commented out to prevent name resolution
-    # problems. This is an opendev local edit.
-    # Note we cannot use settings_local.py as this entry is evaluated at
-    # import time.
-    #"mailman-web",
-    #gethostbyname("mailman-web"),
+    "127.0.0.1",  # OpenDev addition because we use host networking
+    #"mailman-web", # OpenDev edit, won't resolve for us
+    #gethostbyname("mailman-web"), # OpenDev edit, won't resolve for us
     os.environ.get('SERVE_FROM_DOMAIN'),
-    #os.environ.get('DJANGO_ALLOWED_HOSTS'),
 ]
-
-# We have modified handling of DJANGO_ALLOWED_HOSTS here to deserialize a
-# list of hosts into a python list of strings.
-django_allowed_hosts = os.environ.get('DJANGO_ALLOWED_HOSTS')
-if django_allowed_hosts:
-    ALLOWED_HOSTS.extend(django_allowed_hosts.split(':'))
+ALLOWED_HOSTS.extend(os.getenv("DJANGO_ALLOWED_HOSTS", "").split(","))
 
 # Mailman API credentials
 MAILMAN_REST_API_URL = os.environ.get('MAILMAN_REST_URL', 'http://mailman-core:8001')
@@ -194,7 +183,7 @@ AUTH_PASSWORD_VALIDATORS = [
 
 LANGUAGE_CODE = 'en-us'
 
-TIME_ZONE = 'UTC'
+TIME_ZONE = os.environ.get('TZ', 'UTC')
 
 USE_I18N = True
 
diff --git a/playbooks/roles/mailman3/templates/docker-compose.yaml.j2 b/playbooks/roles/mailman3/templates/docker-compose.yaml.j2
index 6014b82fcb..bbc9b53f91 100644
--- a/playbooks/roles/mailman3/templates/docker-compose.yaml.j2
+++ b/playbooks/roles/mailman3/templates/docker-compose.yaml.j2
@@ -41,7 +41,7 @@ services:
       #- MAILMAN_ADMIN_USER={{ mailman3_admin_user }}
       #- MAILMAN_ADMIN_EMAIL={{ mailman3_admin_email }}
       - SERVE_FROM_DOMAIN=lists.opendev.org
-      - DJANGO_ALLOWED_HOSTS={{ mm_domains }}
+      - DJANGO_ALLOWED_HOSTS={{ mm_domains.split(':') | join(',') }}
       - DATABASE_TYPE=mysql
       - DATABASE_URL=mysql://mailman:{{ mailman3_db_password }}@127.0.0.1:3306/mailmandb?charset=utf8mb4
       - HYPERKITTY_API_KEY={{ mailman3_hyperkitty_api_key }}