diff --git a/mail_system/tasks/postfix.yml b/mail_system/tasks/postfix.yml
index 88fa152..e3d7e8d 100644
--- a/mail_system/tasks/postfix.yml
+++ b/mail_system/tasks/postfix.yml
@@ -23,6 +23,7 @@
     name: mailstore
     group: mailstore
     state: present
+    shell: /usr/sbin/nologin
     system: yes
     uid: 5000
     create_home: no