diff --git a/docker-compose.override.yml b/docker-compose.override.yml
new file mode 100644
index 0000000..8357975
--- /dev/null
+++ b/docker-compose.override.yml
@@ -0,0 +1,25 @@
+version: "3.4"
+
+services:
+  webapp:
+    build:
+      context: webapp
+    environment:
+      - PUBLIC_REGISTRATION=true
+  backend:
+    build:
+      context: backend
+    environment:
+      - SMTP_HOST=mailserver
+      - SMTP_PORT=25
+      - SMTP_IGNORE_TLS=true
+      - PUBLIC_REGISTRATION=true
+  mailserver:
+    image: djfarrelly/maildev
+    ports:
+      - 1080:80
+    networks:
+      - hc-network
+
+networks:
+  hc-network: