Until now, email has been one of the easiest routes for attackers trying to breach an organization’s security. Email systems span organizations and connect everyone internally. They’re also the most heavily used applications in most organizations. They contain a vast amount of valuable data for an attacker, and the humans who use email are just that—human. They are prone to click on inviting email links or open legitimate-looking file attachments, and when they do, the attacker gains a foothold in the enterprise environment. From there, he works to find email credentials and reach the email servers.