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Introduction to email

How email works (MTA, MDA, MUA)
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Introduzione alla posta elettronica Introdução ao correio electrónico Einführung zu E-Mails Introduction au courrier électronique Introducción al correo electrónico

What is email?

Electronic mail (also known as email or e-mail) is one of the most commonly used services on the Internet, allowing people to send messages to one or more recipients. Email was invented by Ray Tomlinson in 1972.

Why use email?

The operating principle behind email is relatively simple, which has quickly made it the most popular service used on the Internet.

As with a traditional postal service, for your message to reach your recipient, all you need to know is their address. Its two main advantages over "paper mail" are the speed at which the email is sent (practically instantaneous) and the lower cost (included with the cost of an Internet connection).

What's more, email can be used to instantaneously send a message to several people at once.

Email addresses

Email addresses (both for senders and recipients) are two strings separated by the character "@" (the "at sign"): 

user@domain
The right-hand part describes the domain name involved, and the left-hand part refers to the user who belongs to that domain. One or more mail servers (MX records in the Domain Name System) correspond to each domain.

An email address can be up to 255 characters long and can include the following characters:

  • Lowercase letters from a to z;
  • Digits
  • The characters ".","_" and "-" (full stop, underscore, and hyphen)

In practice, an email address often looks something like this: 

firstname.lastname@provider.domain


Last update on Thursday October 16, 2008 02:43:17 PM.This document entitled « Introduction to email » from Kioskea (en.kioskea.net) is made available under the Creative Commons license. You can copy, modify copies of this page, under the conditions stipulated by the licence, as this note appears clearly.
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