diff --git a/playbooks/templates/chaosknoten/configs/keycloak/compose.yaml.j2 b/playbooks/templates/chaosknoten/configs/keycloak/compose.yaml.j2
index 34a9724..ce051df 100644
--- a/playbooks/templates/chaosknoten/configs/keycloak/compose.yaml.j2
+++ b/playbooks/templates/chaosknoten/configs/keycloak/compose.yaml.j2
@@ -57,6 +57,8 @@ services:
       KC_PROXY: edge
     ports:
       - "8080:8080"
+    extra_hosts:
+      - "send-only-mailserver.ccchh.net:185.161.129.132"
 
   db:
     image: postgres:15.2