diff --git a/docker-compose.stg.yml b/docker-compose.stg.yml
index f96c70c7..95636b67 100644
--- a/docker-compose.stg.yml
+++ b/docker-compose.stg.yml
@@ -18,6 +18,8 @@ services:
       # - SMTP_USE_STARTTLS=yes
     ports:
       - "25:25"
+    networks:
+      - cmc-stg-network
   nginx:
     image: nginx:latest
     container_name: cmc-stg-nginx