Email, also known as electronic mail, is a methodology adopted by users to exchange messages through the use of electronic devices. The email was invented by Ray Tomlinson. During the 1960s, this method started being used by a limited part of people; however, from the mid-1970s this communication form has become very popular in society.
Emails operate across computer networks which nowadays are mostly represented by the Internet. Traditionally, email systems required both recipients and senders to be online at the same time to exchange messages. However, the current email systems are based on a store-and-forward model which accepts, forwards, stores and delivers messages, so as users do not have to be online at the same time to communicate.
Each email is divided into two parts: the message header and the message body. The message header is structured in different fields including from, date, to, subject, Cc, content-type, precedence, message ID, references, in-reply-to, sender, reply-to and archived at.
The message body consists of a plain text or HTML structure which permit users to write plain text messages, as well as attach images and files. Furthermore, they can emphasize the text by using the italics or bold functionalities and change the font style.
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