diff --git a/django_mailbox/admin.py b/django_mailbox/admin.py
index bc3c25a..6bfebd4 100644
--- a/django_mailbox/admin.py
+++ b/django_mailbox/admin.py
@@ -43,7 +43,9 @@ class MailboxAdmin(admin.ModelAdmin):
         'uri',
         'from_email',
         'active',
+        'last_polling',
     )
+    readonly_fields = ['last_polling', ]
     actions = [get_new_mail]