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PRESENTATION ONELECTRONIC MAIL
1) The system of communicating messages in electronic form is called electronic mail or e-mail in short.2) The electronic mail system required a communication network, besides Equipment for sending & receiving mails.
It is believed that the first e-mail was sent by Ray Tomlinson, an engineer, in 1971.
WHAT IS ELECTRONIC MAIL?
• Messages communicated through telex, fax, and computer called
Electronic mails. • The concept of paperless office was evolved in the
year1960s.• Sending and receiving mails through computer
systems aim tomake this concept a reality, besides providing an easy
and economicalMeans of communication.
ADVANTAGES OF E-MAILS
1) Messages through e-mail can be in different forms such
as text, image, sound, database, spreadsheet or an
application.
2) This is very fast and it reaches its destination within a
seconds, unlike conventional postal system.
3) Online availability of the recipient is not required when
sending e-mails.
4) If message cannot be delivered within a reasonable time
limit, they will return back to their sender indicating the
reason for non-delivery. Mails that are returned are
called bounced mails.
An e-mail message is typed by the sender on his computer.
The message has an address that it can be sent directly to the right computer
The message is sent to a server which is connected to the internet.
Server
Router
The e-mail is passed by the router to the server connected to the recipient's computer.
The e-mail is sent to a router by the server. The router sends the messages to another router.
The server reads the address and passes the e-mail to the correct computer.
Routers are connected to each other by telephone lines and cables.
MAIL TRANSFER PROTOCOLS
1) Transmission of message through different computer
networks is standardized through special protocols called
Simple Mail Transfer
Protocols or SMTP in short. This protocol is used for transferring
mails. Actual process of transmitting messages is done by
computer programs
called Transport Agents.. Incoming mails is manages by POP
Post Office Protocol.
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