Email-generation
what is email?
it can take days to send a letter across the country and week to go around world.To save time and money,more and more people are using electronic mail.its fast ,easy and much cheaper than the using the post office.
In its simplest form ,email is an electronic message from one computer to another,You can send or receive.personal and business-related message with attachments ,such as pictures or formatted documents . You can even send music and computer programs.
Email can be sent any where in the word using computer and a modem.Email is almost instant in its delivery and it is very cheap to use especially for international messages,costing only the price of the telephone connection to internet service provider you may send messages at one time or just one to a design location.
Even as email is also Associated with the internet,you do not necessarily have to have an internet connection to able to send and receive email.For example ,many organisations have email facilities within their own local area networks ,but do not have internet links. However usually ,email is part of internet connection and it is one of the most used internet facilitates.
Just as letter makes stops at different postal stations along its way ,email passes from one computer ,known as a mail server, to another as it travels over the internet .Once it arrives at the destination mail server ,it's stored in an electronic mail box until recipient retrieves it This whole process can take seconds ,allowing you to quickly communicate with people around the world at any time. of the day or night.
By using email you will be able to electronically
1)Send messages
2)Receive and read messages
3)Reply to messages
4)Forward messages
5)send the message to a list of people with one stroke
6)Attach a text file such as report to your email message
7)Save mail to a file print the message
Email Address
In order to receive or send email you need to have an email address and you need to know the address of the person to whom you wish to send a message.
Address are made up in a standard way using the following elements;
*User identification Example; Sachin your name or a name you wish choose.It is usual to have part of your own name to make it easily identifiable
* the @ or at symbol to locate the person
*the domain name of the computer receiving your mail Example; Sri Ramkrishna Engineering college
* the type of organisation example; edu for an educational institution or gov. for government
*and finally in to locate the address in India sachin@srec.edu.in
You will find variations in address but they will always have these common elements.
* the @ or at symbol to locate the person
*the domain name of the computer receiving your mail Example; Sri Ramkrishna Engineering college
* the type of organisation example; edu for an educational institution or gov. for government
*and finally in to locate the address in India sachin@srec.edu.in
You will find variations in address but they will always have these common elements.
How does the email works?
Email is based on a client-server model.
The client
The client carries out the users interactions with the email server .Clients can appear in various forms.
* Application based
these are installed onto users machines and include Microsoft outlook and the freely available Outlook Express and Eudora.
* web based
these appear in a web browser's window and include Hotmail,yahoo and out look web client
Client vary greatly in functionality ,but all provide a basic level of functionality that assists the user.Functions include the ability to create new email,display and store received emails,hold address lists of contacts,a calendar ,journal and other extra functions that help organise the user's working day.The client is also configured with the account information and names or IP address of the email servers with which it will be communicating in order to send and receive emails
The server
An Email server is typically a combination of process running on a server with a large storage capacity- a list of the users and rules,and the capability to receive ,send and store emails and attachments .The servers are designed to operate without constant user intervention and should happily process emails for months as sending ,receiving and maintenance tasks are carried out at scheduled times.
The client only has to connect to the email server when it sends and check/receives new email.Sometimes it may be permanently connected to the server to allow access to shared address books or calendar information -this is typical of a LAN-based email server.
How do email servers work?
Most email servers conduct email services by running two separate processes on the same machine.One process is the POP3 server which holds emails in a queue and delivers emails to the client when they are requested
The other is the SMTP(simple mail transfer protocol)server that sends outgoing emails from clients and sends& receives email from other SMTP servers.These two processes are linked by an internal mail delivery mechanism that moves mail between the POP3 and SMTP servers.When the client calls the email server to send or check for mail it connects to the server on certain TCP/IP ports;SMTP on port 25 to send email and when it checks for a new email .POP3 on port shows the relationship between the clients,servers,POP3,SMTP and the internet.
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