‘Dead letter box’ system
British nationals use a sophisticated ‘dead letter’ email system to smuggle their way into Iraq and Syria to join ISIS, with terrorist handlers employing ‘silent’ email addresses that do not actually send messages, but contain instructions in the Draft folder. Militants are then moved secretly across Europe and smuggled across the Turkish border to training camps in Syria. As many as 20 British nationals are believed to be waiting in safe houses or hotels for the all-clear to cross the border.