diff --git a/docker-compose.dev-multi.yml b/docker-compose.dev-multi.yml
index f19f32c9dc..c629435cc1 100644
--- a/docker-compose.dev-multi.yml
+++ b/docker-compose.dev-multi.yml
@@ -175,7 +175,10 @@ services:
       - "${DEV_BIND_ADDRESS:-0.0.0.0}:${FORWARD_MAILPIT_PORT:-1025}:1025"
       - "${DEV_BIND_ADDRESS:-0.0.0.0}:${FORWARD_MAILPIT_DASHBOARD_PORT:-8025}:8025"
     networks:
-      - coolify
+      coolify:
+        # The seeded instance SMTP settings (InstanceSettingsSeeder) use coolify-mail:1025.
+        aliases:
+          - coolify-mail
 
   minio:
     profiles: ["minio"]