diff --git a/roles/docker/tasks/services/postfix.yml b/roles/docker/tasks/services/postfix.yml
index 3ab9d3c..70f5e5d 100644
--- a/roles/docker/tasks/services/postfix.yml
+++ b/roles/docker/tasks/services/postfix.yml
@@ -15,5 +15,5 @@
     networks:
       - name: postfix
     env:
-      ALLOWED_SENDER_DOMAINS: "{{ base_domain }}"
+      ALLOWED_SENDER_DOMAINS: "services.{{ base_domain }}"