E-mail is one of the most widely used forms of communication today. Estimates from May 2009 suggest that around 250 billion–with a “B”–e-mails are sent every day. Don’t leave your e-mail client open–or at least not maximized on screen. Make sure that snooping eyes can’t see what’s on your screen when you walk away from your PC for an extended period of time. Use private browsing to make your entire Web session more secure.”]
Source: https://www.csoonline.com/article/2126320/top-secret–keep-your-e-mail-private-and-secure.html