diff --git a/dms/docker-compose.yml b/dms/docker-compose.yml
index 99cd18b..ebc0155 100644
--- a/dms/docker-compose.yml
+++ b/dms/docker-compose.yml
@@ -32,7 +32,7 @@ services:
     container_name: dms-roundcube
     environment:
       - ROUNDCUBEMAIL_DEFAULT_HOST=mail.andreasknuth.de
-      - ROUNDCUBEMAIL_DEFAULT_PORT=1443  # Dein IMAP-Port
+      - ROUNDCUBEMAIL_DEFAULT_PORT=143  # Dein IMAP-Port
       - ROUNDCUBEMAIL_SMTP_SERVER=mail.andreasknuth.de
       - ROUNDCUBEMAIL_SMTP_PORT=2587
       - ROUNDCUBEMAIL_PLUGINS=archive,zipdownload,managesieve,password  # Für Features
diff --git a/dms/roundcube/config.inc.php b/dms/roundcube/config.inc.php
index a809c6d..024be9f 100644
--- a/dms/roundcube/config.inc.php
+++ b/dms/roundcube/config.inc.php
@@ -66,4 +66,12 @@ $config['plugins'] = [
 $config['skin'] = 'elastic';
 
 $config['plugins'] = ['managesieve', 'password'];
-$config['managesieve_host'] = 'mail.andreasknuth.de';
\ No newline at end of file
+$config['managesieve_host'] = 'mail.andreasknuth.de';
+
+$config['default_host'] = 'dms-mailserver';  // Container-Name statt mail.andreasknuth.de
+$config['imap_conn_options'] = [
+  'ssl' => [
+    'verify_peer' => false,
+    'verify_peer_name' => false,
+  ],
+];
\ No newline at end of file