CIOs need to acknowledge that there might be passwords on their networks, find them and destroy them. Companies need a policy that explicitly states what can and cannot be sent out via e-mail or IM. Outbound scanning systems are inexpensive and are offered by scores of messaging vendors. A hacker, malcontent employee or grandmother with a minimal amount of computer know-how could unlock those documents and ravage your company’s most sensitive applications. An outbound scanning system can look for sensitive content in e-mails.”]
Source: https://www.csoonline.com/article/2119339/50-cent-holes.html