In this day and age, no one’s a stranger to email. The world’s most popular form of peer-to-peer messaging reached new heights in 2015, when users sent and received a collective 205 billion emails.

A simple email marketing trick is also abused by cyber-criminals, who are employing a technique known as "pixel tracking" to gather information on possible targets or to improve the efficiency of ...

More than 160 billion emails sent every day contain invisible trackers monitoring receivers' online activities. This is the latest worrying data gathered by one of the best VPN providers, Proton VPN.