Electronic mail is a way of exchanging messages between people using electronic devices. It was Invented by Ray Tomlinson, email first started limited use in the 1960s and by the mid-1970s had taken the form now known as email. Email works across computer networks, which today is essentially the Internet. An email is a basic tool in marketing, also a very personal process of reaching your target customers. That’s why email tracking is a really important part of the digital ecosystem.