diff -urN plugins.orig/managesieve/config.inc.php.dist plugins/managesieve/config.inc.php.dist
--- plugins.orig/managesieve/config.inc.php.dist	2013-03-27 22:51:27.000000000 +0200
+++ plugins/managesieve/config.inc.php.dist	2013-07-27 13:53:43.000000000 +0300
@@ -34,6 +34,12 @@
 // The name of the script which will be used when there's no user script
 $rcmail_config['managesieve_script_name'] = 'managesieve';
 
+// The sieve script header (comments)
+//$rcmail_config['managesieve_script_prefix'] = '# roundcube sieve script';
+
+// The sieve script top commands
+//$rcmail_config['managesieve_script_top_commands'] = 'require ["include"]; include :global "global-spam";'."\n";
+
 // Sieve RFC says that we should use UTF-8 endcoding for mailbox names,
 // but some implementations does not covert UTF-8 to modified UTF-7.
 // Defaults to UTF7-IMAP
diff -urN plugins.orig/managesieve/lib/rcube_sieve_script.php plugins/managesieve/lib/rcube_sieve_script.php
--- plugins.orig/managesieve/lib/rcube_sieve_script.php	2013-03-27 22:51:27.000000000 +0200
+++ plugins/managesieve/lib/rcube_sieve_script.php	2013-07-27 15:25:22.000000000 +0300
@@ -29,6 +29,7 @@
 
     private $vars = array();        // "global" variables
     private $prefix = '';           // script header (comments)
+    private $top_commands = '';     // script top commands
     private $supported = array(     // Sieve extensions supported by class
         'fileinto',                 // RFC5228
         'envelope',                 // RFC5228
@@ -173,6 +174,16 @@
     }
 
     /**
+     * Sets script top commands
+     *
+     * @param string $text  top commands
+     */
+    public function set_top_commands($text)
+    {
+        $this->top_commands = $text;
+    }
+
+    /**
      * Returns script as text
      */
     public function as_text()
@@ -438,6 +449,17 @@
             }
         }
 
+        if (!empty($this->top_commands)) {
+            if (substr($output, 0, strlen($this->top_commands)) != $this->top_commands) {
+                $top_commands_without_require = trim(preg_replace('/^(\s*require.+;\s*\r?\n?\s*)+/', '', $this->top_commands));
+                if (substr($output, 0, strlen($top_commands_without_require)) != $top_commands_without_require) {
+                    $output = $this->top_commands . $output;
+                } else {
+                    $output = preg_replace('/^(\s*require.+;\s*\r?\n?\s*)+.*/', '$1', $this->top_commands) . $output;
+                }
+            }
+        }
+
         // requires
         if (!empty($exts))
             $output = 'require ["' . implode('","', array_unique($exts)) . "\"];\n" . $output;
diff -urN plugins.orig/managesieve/managesieve.php plugins/managesieve/managesieve.php
--- plugins.orig/managesieve/managesieve.php	2013-03-27 22:51:28.000000000 +0200
+++ plugins/managesieve/managesieve.php	2013-07-27 13:43:46.000000000 +0300
@@ -273,6 +273,8 @@
 
             if ($script_name) {
                 $this->sieve->load($script_name);
+                $this->sieve->script->set_prefix($this->rc->config->get('managesieve_script_prefix'));
+                $this->sieve->script->set_top_commands($this->rc->config->get('managesieve_script_top_commands'));
             }
 
             $error = $this->sieve->error();