diff --git a/docker-compose.override.yml b/docker-compose.override.yml
index 9507d9eb32..2129b5023a 100644
--- a/docker-compose.override.yml
+++ b/docker-compose.override.yml
@@ -4,6 +4,9 @@ version: "3"
 # They are made to ease your life as a developer.
 # **NOT** production ready !
 
+volumes:
+  smtp_maildir:
+
 services:
   georchestra.mydomain.org:
     image: traefik
@@ -28,20 +31,22 @@ services:
   smtp:
     build: docker/smtp/smtp-sink
     image: camptocamp/smtp-sink:latest
+    volumes:
+      - smtp_maildir:/home/smtp/Maildir/
 
   courier-imap:
     build: docker/smtp/courier-imap
     image: camptocamp/courier-imap:latest
-    volumes_from:
-      - smtp:rw
+    volumes:
+      - smtp_maildir:/home/smtp/Maildir/
 
   webmail:
     build: docker/smtp/webmail
     image: camptocamp/sqwebmail:latest
     ports:
       - "8081:80"
-    volumes_from:
-      - smtp:rw
+    volumes:
+      - smtp_maildir:/home/smtp/Maildir/
 
   geodata:
     build: docker/ssh_data