diff --git a/roles/mailman/tasks/main.yml b/roles/mailman/tasks/main.yml
index 4cbe733..d8a9e4c 100644
--- a/roles/mailman/tasks/main.yml
+++ b/roles/mailman/tasks/main.yml
@@ -12,7 +12,7 @@
   ansible.builtin.copy:
     src: ./files/mailman.cfg
     dest: /etc/mailman3/mailman.cfg
-    mode: 0644
+    mode: 0640
   notify: Restart mailman3
 
 - name: Start mailman3 service