diff --git a/DMS/docker-compose.yml b/DMS/docker-compose.yml
index 79d2502..9c49dd7 100644
--- a/DMS/docker-compose.yml
+++ b/DMS/docker-compose.yml
@@ -12,7 +12,7 @@ services:
     hostname: node1.email-srvr.com
 
     ports:
-      - "25:25"
+      - "127.0.0.1:25:25"
       - "587:587"
       - "465:465"
       - "143:143"