diff --git a/roles/tools/templates/docker-compose.yml.j2 b/roles/tools/templates/docker-compose.yml.j2
index 17f0fed..f884506 100644
--- a/roles/tools/templates/docker-compose.yml.j2
+++ b/roles/tools/templates/docker-compose.yml.j2
@@ -139,7 +139,8 @@ services:
     domainname: {{ domain_base }}
     restart: unless-stopped
     networks:
-      - mail-internal
+      - mail-internal   # Outline → mailserver (internal)
+      - front           # mailserver → internet (outbound delivery)
     environment:
       - SMTP_ONLY=1              # no IMAP/POP3, sending only
       - ENABLE_RSPAMD=0          # lightweight: skip spam filter