Email is here to stay. Despite the growing popularity of applications like WhatsApp, email is still considered to be the most important communication tool for online workers 1and is likely to grow in importance over the next five years2. A problem with email however is that email was designed in a time when Internet security was non existing. Email can be easily forged and intercepted. Growing economic espionage is becoming more and more a problem for companies worldwide. The FBI estimates that economic espionage "costs the American economy hundreds of billions of dollars per year" 3. New laws, like the European "General Data Protection Regulation", requires companies to protect all personal data. Non compliance can lead to "a fine up to 100 000 000 EUR or up to 5% of the annual worldwide turnover in case of an enterprise, whichever is greater".