diff --git a/DMS/docker-compose.yml b/DMS/docker-compose.yml
index 79e6843..4ebf0d7 100644
--- a/DMS/docker-compose.yml
+++ b/DMS/docker-compose.yml
@@ -140,6 +140,9 @@ services:
       - ROUNDCUBEMAIL_SMTP_SERVER=tls://mailserver     # intern, kein externer DNS-SNI-Chaos
       - ROUNDCUBEMAIL_SMTP_PORT=587
       - ROUNDCUBEMAIL_PLUGINS=password,email_config
+      # NEU: Schaltet die strikte PHP-Zertifikatsprüfung für interne Verbindungen ab
+      - ROUNDCUBEMAIL_IMAP_CONN_OPTIONS={"ssl":{"verify_peer":false,"verify_peer_name":false}}
+      - ROUNDCUBEMAIL_SMTP_CONN_OPTIONS={"ssl":{"verify_peer":false,"verify_peer_name":false}}      
     ports:
       - "8888:80"
     volumes: