diff --git a/blacklist_sender_domain.map b/blacklist_sender_domain.map
index 5515626..e87e71f 100644
--- a/blacklist_sender_domain.map
+++ b/blacklist_sender_domain.map
@@ -4,3 +4,4 @@ xxx.com
 rr.com
 mm
 b2bmailsolutions.com
+sys.ba