I want to take a moment to reinforce the major points of this article by Deb Radcliff The Surprising Security Threat: Your Printers.  Many years ago when I managed security for a financial firm, the company decided to remove the existing networked printers and replace them with multi-function devices.  Multi-function devices can print, staple, collate, copy, scan, and send email.  They have hard drives and operating systems.  The security department refused to sanction the email capability.