diff --git a/compose.yml b/compose.yml
index a175061..ba0b30e 100644
--- a/compose.yml
+++ b/compose.yml
@@ -2,6 +2,8 @@ services:
   postgres:
     image: postgres:15
     container_name: info-marche-quimpernetignet_postgres
+    networks:
+      - mailserver
     env_file:
       - .env
       - ../passwords/info-marche-quimpernetignet.pass
@@ -11,6 +13,8 @@ services:
   listmonk:
     image: listmonk/listmonk:latest
     container_name: info-marche-quimpernetignet_listmonk
+    networks:
+      - mailserver
     depends_on:
       - postgres
     env_file:
@@ -23,3 +27,6 @@ services:
       - ./volumes/uploads:/listmonk/uploads
       - ./conf/static:/listmonk/static
     restart: unless-stopped
+networks:
+  mailserver:
+    external: true