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Electronic mail, which has come to be known as e-mail is one of the most popular services on the Internet. E-mail allows users to send digital messages to storage areas known as mailboxes on server computers where they can be read by other users. Each user has ones own e-mail address, which determines where their e-mail is stored. A typical e-mail address might have the following components: username of identifier, @, server name, type of organization, country (e.g. locka@pesto.co.uk)*
The e-mail message has two main parts known as the header and the body of the message. The body contains the message itself, the header reveals the identity of the recipient and the sender, the date it was sent, and the subject title of the message.
The message header should include at least the following fields:
From: The e-mail address, and optionally the name of the author(s). To: The e-mail address(es), and optionally name(s) of the message's recipient(s). Subject: A brief summary of the topic of the message. Certain abbreviations are commonly used in the subject, some of which are automatically inserted by the e-mail client, including Re: ("in the matter of"), FW: (forward), FYI: (for your information), I: (information), and EOM (end of message, used at the end of the subject when the entire content of the e-mail is contained in the subject and the body remains empty).
Date: The local time and date when the message was written. Message-ID: Also an automatically generated field; used to prevent multiple delivery and for reference in In-Reply-To:.
Formatted text, spreadsheets, sound files or video files can be attached to mail messages.
One of the biggest problems in e-mailing is spam. To prevent e-mail spam, both end users and administrators of e-mail systems use various anti-spam techniques. Some of these techniques have been embedded in products, services and software to ease the burden on users and administrators. Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by e-mail administrators, those that can be automated by e-mail senders and those employed by researchers and law enforcement officials.
Groups of users that share a special interest can subscribe to free newsgroups on the Internet. Users subscribe by registering their e-mail addresses. Subscribers can send plain text messages to a common area on a server computer where all the newsgroup members can read them. In this way, conversations about the special interest can take place between all the members of the group. The name of the newsgroup is made up of different parts separated by dots and indicates the special area the subscribers are interested in
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