diff --git a/blacklist_sender_domain.map b/blacklist_sender_domain.map
index ed75ba2..4baea52 100644
--- a/blacklist_sender_domain.map
+++ b/blacklist_sender_domain.map
@@ -6,3 +6,4 @@ mm
 b2bmailsolutions.com
 sys.ba
 callloop.com
+tholen-gruppe.de