diff --git a/docker-compose.yml b/docker-compose.yml
index 0a7a40b..9617e0d 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -25,6 +25,7 @@ services:
       - ENABLE_POP3=1
       - ENABLE_IMAP=1
       - SPOOF_PROTECTION=1
+      - POSTMASTER_ADDRESS=admin@sda.zone
       - LOG_LEVEL=info
       - SUPERVISOR_LOGLEVEL=info
       - PFLOGSUMM_TRIGGER=daily_cron