Not only private persons are victims of espionage by foreign agencies. Especially successful industries are coveted targets for thieves from all around the world as well as from their own country. According to a recent study concerning the German and Austrian economy especially SME, aviation, shipbuilding and engineering companies in general are the primary targets. An often-underestimated security loophole is the electronic communication via email. Around 41% of the interviewed companies registered or suspected attacks on their electronic communication. This so far neglected security gap however can easily be closed.