Knowlegde Through Fun Welcome To Mady's Site.

p>An E-mail MessageThe first e-mail message was sent in 1971 by an
engineer named Ray Tomlinson. Prior to this, you could only send
messages to users on a single machine. Tomlinson's breakthrough was
the ability to send messages to other machines on the Internet, using
the @ sign to designate the receiving machine.
An e-mail message has always been nothing more than a simple text
message -- a piece of text sent to a recipient. In the beginning and
even today, e-mail messages tend to be short pieces of text, although
the ability to add attachments now makes many e-mail messages quite
long. Even with attachments, however, e-mail messages continue to be
text messages -- we'll see why when we get to the section on
attachments
E-mail Clients
You have probably already received several e-mail messages today. To
look at them, you use some sort of e-mail client. Many people use
well-known stand-alone clients like Microsoft Outlook, Outlook
Express, Eudora or Pegasus. People who subscribe to free e-mail
services like Hotmail or Yahoo use an e-mail client that appears in a
Web Page. If you are an AOL customer, you use AOL's e-mail reader. No
matter which type of client you are using, it generally does four
things:
It shows you a list of all of the messages in your mailbox by
displaying the message headers. The header shows you who sent the
mail, the subject of the mail and may also show the time and date of
the message and the message size.
It lets you select a message header and read the body of the e-mail message.
It lets you create new messages and send them. You type in the e-mail
address of the recipient and the subject for the message, and then
type the body of the message.
Most e-mail clients also let you add attachments to messages you send
and save the attachments from messages you receive.
Sophisticated e-mail clients may have all sorts of bells and whistles,
but at the core, this is all that an e-mail client does.

A Simple E-mail Server
Given that you have an e-mail client on your machine, you are ready to
send and receive e-mail. All that you need is an e-mail server for the
client to connect to. Let's imagine what the simplest possible e-mail
server would look like in order to get a basic understanding of the
process. Then we will look at the real thing.
You know that machines on the Internet can run software applications
that act as servers. There are Web servers, FTP servers, telnet
servers and e-mail servers running on millions of machines on the
Internet right now. These applications run all the time on the server
machine and they listen to specific ports, waiting for people or
programs to attach to the port . The simplest possible e-mail server
would work something like this:
It would have a list of e-mail accounts, with one account for each
person who can receive e-mail on the server. My account name might be
mbrain, John Smith's might be jsmith, and so on.
It would have a text file for each account in the list. So the server
would have a text file in its directory named MBRAIN.TXT, another
named JSMITH.TXT, and so on.
If someone wanted to send me a message, the person would compose a
text message ("Marshall, Can we have lunch Monday? John") in an e-mail
client, and indicate that the message should go to mbrain. When the
person presses the Send button, the e-mail client would connect to the
e-mail server and pass to the server the name of the recipient
(mbrain), the name of the sender (jsmith) and the body of the message.
The server would format those pieces of information and append them to
the bottom of the MBRAIN.TXT file. The entry in the file might look
like this:
From: jsmith To: mbrain Marshall, Can we have lunch Monday? John
There are several other pieces of information that the server might
save into the file, like the time and date of receipt and a subject
line; but overall, you can see that this is an extremely simple
process.
As other people sent mail to mbrain, the server would simply append
those messages to the bottom of the file in the order that they
arrived. The text file would accumulate a series of five or 10
messages, and eventually I would log in to read them. When I wanted to
look at my e-mail, my e-mail client would connect to the server
machine. In the simplest possible system, it would:
Ask the server to send a copy of the MBRAIN.TXT file
Ask the server to erase and reset the MBRAIN.TXT file
Save the MBRAIN.TXT file on my local machine
Parse the file into the separate messages (using the word "From:" as
the separator)
Show me all of the message headers in a list
When I double-clicked on a message header, it would find that message
in the text file and show me its body.
You have to admit that this is a very simple system. Surprisingly, the
real e-mail system that you use every day is not much more complicated
than this.

The Real E-mail System
For the vast majority of people right now, the real e-mail system
consists of two different servers running on a server machine. One is
called the SMTP server, where SMTP stands for Simple Mail Transfer
Protocol. The SMTP server handles outgoing mail. The other is either a
POP3 server or an IMAP server, both of which handle incoming mail. POP
stands for Post Office Protocol, and IMAP stands for Internet Mail
Access Protocol.

The SMTP server listens on well-known port number 25, POP3 listens on
port 110 and IMAP uses port 143