E-mail is a method of exchanging digital messages across the Internet or other computer networks continuously.
In its infancy was Instant mailed must enter both the sender and the addressee to the network at the same time to move the message between them in real time as it is in talks Instant intraday known today , but the e-mail later became based on the principle of storage and scrolling, where the store messages contained in the users' mailboxes to learn about them at the time they want.
The beginnings of the system
Emerged the beginnings of what would later become the e-mail network Erpant , the predecessor of the Internet that you know today, and evolution in several stages Among them was to send Ray Tomlinson in 1971 the first message using the symbol " @ " to separate the user name title PC as settled by the situation today. With this there is the inventor of individual e-mail as it evolved in several steps converted to Islam each to the next.
How e - mail works
How e-mail works.png
Figure contrast illustrates the modus operandi of mail through the steps numbered , when you want to send it تحتاح to the mail client software such as Microsoft outlook and put the title future and after you press the submit button the client program coordinated message on the structure of e-mail and be on a certain formula and then the software will send the message by Protocol ( SMTP ) to a client transmission ( mail transfer agent ( MTA is here smtp.a.org
He is looking for the address b.org who shall sending server ns.b.org -
The server ns.b.org the address to send the mailman (mail exchange) and be often mx.b.org to the server a.org
The a.org sends the message to the SMTP protocol mx.b.org by
The mx.b.org developing the message in a box Pop
Bob bring the message by the system ( POP3 ( Post Office Protocol of Buraydah Fund .
E-mail features
The possibility of sending a message to multiple recipients.
Send a message that includes audio , video , text , images and maps.
Speed to send messages , where you do not send the message takes only a few seconds to reach the addressee in the absence of the arrival of the letter, the program inform the sender accordingly .
The user can extract messages from the mailbox through the mail program that enables the user to see the messages and based on his desire if he wants to send an answer to any of them , and when it starts to request e-mail is telling the user the existence of messages waiting in your mailbox by displaying one line for each mail message mail has reached the line gives the name of the sender and the message arrival time and the length of the message in the list .
The user can choose the message of the summary and the e-mail system displays its contents and after watching the message to the user to choose the process desired by either respond to the sender or leave message in the mailbox to see them again when needed or keeps a copy of the letter in a file or get rid of the message cancel .
Examples of e-mail services on the Web [edit]
Zembra
Google Mail ( Gmail )
Yahoo Mail !
Windows Live Hotmail
Dealing with e-mail
Maicon often dealt with through e-mail page for the destination that offers e-mail service on the Web to send and receive messages, and special programs can be used to send and receive messages such as :
Outlook program (OutLook).
إيودورا program (Eudora).
Miles program (Mail) for Macs
E-mail security
E-mail security is the primary means of business communication, its use is increasing day by day. Used to transfer text messages and transfer documents, databases , and as the data transfer process is very sensitive safety of these data are questionable , and this is a problem ; door is open on the details of contracts between competing companies and the worst of it that there is the capacity for forging letters of Kherneh , there are a number of unreported attacks of this kind.