diff --git a/inventory/group_vars/mailman b/inventory/group_vars/mailman
index d8a3605633..31905f4bff 100644
--- a/inventory/group_vars/mailman
+++ b/inventory/group_vars/mailman
@@ -18,5 +18,8 @@ fedmsg_certs:
   owner: mailman
   group: mailman
 
+# Postfix main.cf
+postfix_group: mailman
+
 # Used by the mailman role
 mailman_dbserver: db01.phx2.fedoraproject.org
diff --git a/inventory/group_vars/mailman-stg b/inventory/group_vars/mailman-stg
index 1e0b57b5ea..bc2850214a 100644
--- a/inventory/group_vars/mailman-stg
+++ b/inventory/group_vars/mailman-stg
@@ -28,5 +28,8 @@ virt_install_command: /usr/sbin/virt-install -n {{ inventory_hostname }} -r {{ m
                   hostname={{ inventory_hostname }}"
                  --network=bridge=br0 --autostart --noautoconsole
 
+# Postfix main.cf
+postfix_group: mailman-stg
+
 # Used by the mailman role
 mailman_dbserver: db02.stg.phx2.fedoraproject.org