here we have intro of email services along with their protocols and models (layers)

1. WORKING OF EMAIL SERVICES
Members:
Sabin Dumre(ACE074BCT058)
Shashank Kafle (ACE074BCT070)
Sulav Bahadur Pradhan(ACE074BCT087)
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2. INTRODUCTION
 Electronic mail is a method of exchanging messages between people using
electronic devices. Some email services are: Gmail, Hotmail,Yahoo.
 After a user clicks the send button various procedures are followed for the email
to reach its destination.Various network models and protocols are used in
sending the email.
 The models and protocols are explained in the following slides.
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3. PROTOCOLS
 IMAP(Internet Message Access Protocol) /POP(Post Office
Protocol):
These protocols are used for the communication between the user and the server. One of
these protocols are used.
• IMAP
It is a standard email protocol that stores email messages on a mail server, but allows the end
user to view and manipulate the messages as though they were stored locally on the end user's
computing device(s).
 POP
The Post Office Protocol is an application-layer Internet standard protocol used by e-mail clients
to retrieve e-mail from a mail server.
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4. CONTD.…
 SMTP(Simple MailTransfer Protocol)
It is used in the communication between different servers.
SMTP is a set of communication guidelines that allow software to transmit
an electronic mail over the internet is called Simple MailTransfer Protocol.
It is a program used for sending messages to other computer users based
on e-mail addresses.
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5. OSI LAYERS
OSI(Open System Interconnection Model)
1. Application Layer: A Separate Email is created by the Application Layer
using the SMTP protocol. The Application layer places a header
(encapsulation) field that contains information such as screen size and fonts,
and passes the data to the Presentation layer.
2. Presentation Layer:This layer places header information.The text in the
message is converted to ASCII.The Presentation layer will then pass the new
data to the Session layer.
3. Session Layer:This Layer will start a new and separate session for
communication between the devices and manages the flow of data in the same
session only and data received from previous layer is sent to theTransportation
Layer.
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6. CONTD….
4. Transportation Layer: Here the Data received is broken into segments of Data and
pushes them forward to Network Layer.
5. Network Layer:This Layer stores the Source and Destination addresses so a network
is formed, it converts the segments received into packets.
6. Data Layer:The data of the packets is converted into Frames.Then the data is send
to Physical Layer.
7. Physical Layer:The data of the Frames is converted into bit stream (the information
is in binary 0’s and 1’s) and eventually the data is reached to the Receiver’s end
(teacher).
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