diff --git a/redash/handlers/authentication.py b/redash/handlers/authentication.py
index 61b647eb5c..2776816033 100644
--- a/redash/handlers/authentication.py
+++ b/redash/handlers/authentication.py
@@ -224,7 +224,7 @@ def client_config():
         'showPermissionsControl': current_org.get_setting("feature_show_permissions_control"),
         'allowCustomJSVisualizations': settings.FEATURE_ALLOW_CUSTOM_JS_VISUALIZATIONS,
         'autoPublishNamedQueries': settings.FEATURE_AUTO_PUBLISH_NAMED_QUERIES,
-        'mailSettingsMissing': settings.email_server_is_configured(),
+        'mailSettingsMissing': not settings.email_server_is_configured(),
         'dashboardRefreshIntervals': settings.DASHBOARD_REFRESH_INTERVALS,
         'queryRefreshIntervals': settings.QUERY_REFRESH_INTERVALS,
         'googleLoginEnabled': settings.GOOGLE_OAUTH_ENABLED,