diff --git a/playbooks/templates/chaosknoten/configs/engelsystem/compose.yaml.j2 b/playbooks/templates/chaosknoten/configs/engelsystem/compose.yaml.j2
index b858ad0..d2547bc 100644
--- a/playbooks/templates/chaosknoten/configs/engelsystem/compose.yaml.j2
+++ b/playbooks/templates/chaosknoten/configs/engelsystem/compose.yaml.j2
@@ -31,6 +31,9 @@ services:
       - internet
     depends_on:
       - es_database
+    extra_hosts:
+      - "send-only-mailserver.ccchh.net:185.161.129.132"
+
   es_database:
     image: mariadb:10.2
     restart: unless-stopped