--- plugins/managesieve/lib/Roundcube/rcube_sieve_engine.php
+++ plugins/managesieve/lib/Roundcube/rcube_sieve_engine.php
@@ -529,28 +529,13 @@
         // get request size limits (#1488648)
         $max_post = max([
                 ini_get('max_input_vars'),
-                ini_get('suhosin.request.max_vars'),
-                ini_get('suhosin.post.max_vars'),
         ]);
-        $max_depth = max([
-                ini_get('suhosin.request.max_array_depth'),
-                ini_get('suhosin.post.max_array_depth'),
-        ]);
 
         // check request size limit
         if ($max_post && count($_POST, COUNT_RECURSIVE) >= $max_post) {
             rcube::raise_error([
                     'code' => 500, 'file' => __FILE__, 'line' => __LINE__,
                     'message' => "Request size limit exceeded (one of max_input_vars/suhosin.request.max_vars/suhosin.post.max_vars)"
-                ], true, false
-            );
-            $this->rc->output->show_message('managesieve.filtersaveerror', 'error');
-        }
-        // check request depth limits
-        else if ($max_depth && count($_POST['_header']) > $max_depth) {
-            rcube::raise_error([
-                    'code' => 500, 'file' => __FILE__, 'line' => __LINE__,
-                    'message' => "Request size limit exceeded (one of suhosin.request.max_array_depth/suhosin.post.max_array_depth)"
                 ], true, false
             );
             $this->rc->output->show_message('managesieve.filtersaveerror', 'error');
--- program/lib/Roundcube/bootstrap.php
+++ program/lib/Roundcube/bootstrap.php
@@ -32,13 +32,11 @@
     // Some users are not using Installer, so we'll check some
     // critical PHP settings here. Only these, which doesn't provide
     // an error/warning in the logs later. See (#1486307).
-    'mbstring.func_overload' => 0,
 ];
 
 // check these additional ini settings if not called via CLI
 if (php_sapi_name() != 'cli') {
     $config += [
-        'suhosin.session.encrypt' => false,
         'file_uploads'            => true,
         'session.auto_start'      => false,
         'zlib.output_compression' => false,