diff --git a/modoboa/core/commands/templates/settings.py.tpl b/modoboa/core/commands/templates/settings.py.tpl
index aca3abeaa..3f7ec5cf8 100644
--- a/modoboa/core/commands/templates/settings.py.tpl
+++ b/modoboa/core/commands/templates/settings.py.tpl
@@ -295,6 +295,10 @@ LOGGING = {
     }
 }
 
+SILENCED_SYSTEM_CHECKS = [
+    "security.W019",  # modoboa uses iframes to display e-mails
+]
+
 # Load settings from extensions
 {% for extension in extra_settings %}
 try: