diff --git a/dms/docker-compose.yml b/dms/docker-compose.yml
index 4caabc5..7e103de 100644
--- a/dms/docker-compose.yml
+++ b/dms/docker-compose.yml
@@ -31,8 +31,8 @@ services:
     image: roundcube/roundcubemail:latest
     container_name: dms-roundcube
     environment:
-      - ROUNDCUBEMAIL_DEFAULT_HOST=mail.andreasknuth.de
-      - ROUNDCUBEMAIL_DEFAULT_PORT=143  # Dein IMAP-Port
+      - ROUNDCUBEMAIL_DEFAULT_HOST=ssl://dms-mailserver  # Or ssl://mail.andreasknuth.de; use Container-Name for internal
+      - ROUNDCUBEMAIL_DEFAULT_PORT=993  # Internal IMAPS port
       - ROUNDCUBEMAIL_SMTP_SERVER=mail.andreasknuth.de
       - ROUNDCUBEMAIL_SMTP_PORT=587
       - ROUNDCUBEMAIL_PLUGINS=archive,zipdownload,managesieve,password  # Für Features
diff --git a/dms/roundcube/config.inc.php b/dms/roundcube/config.inc.php
index 024be9f..403ce9d 100644
--- a/dms/roundcube/config.inc.php
+++ b/dms/roundcube/config.inc.php
@@ -73,5 +73,6 @@ $config['imap_conn_options'] = [
   'ssl' => [
     'verify_peer' => false,
     'verify_peer_name' => false,
+    'allow_self_signed' => true,
   ],
 ];
\ No newline at end of file