--- /dev/null
+<?php
+
+// $rcmail_config['additional_message_headers']['X-Remote-Browser'] = $_SERVER['HTTP_USER_AGENT'];
+// $rcmail_config['additional_message_headers']['X-Originating-IP'] = $_SERVER['REMOTE_ADDR'];
+// $rcmail_config['additional_message_headers']['X-RoundCube-Server'] = $_SERVER['SERVER_ADDR'];
+
+// if( isset( $_SERVER['MACHINE_NAME'] )) {
+// $rcmail_config['additional_message_headers']['X-RoundCube-Server'] .= ' (' . $_SERVER['MACHINE_NAME'] . ')';
+// }
+
+// To remove (e.g. X-Sender) message header use null value
+// $rcmail_config['additional_message_headers']['X-Sender'] = null;
+
+?>