PresentPresentation ation on on

How How Email Email WorksWorksPresenters:Presenters:

Candy SikandCandy Sikand

Jyoti KarwalJyoti Karwal

Vishav KhajuriaVishav Khajuria

Table of ContentsTable of Contents

Origin of EmailOrigin of Email Email BasicsEmail Basics Email FormatEmail Format How Email WorksHow Email Works Protocols Protocols Snail mail vs. EmailSnail mail vs. Email Uses of EmailUses of Email Problems with EmailProblems with Email

Contd……Contd……

Various Email Service ProvidersVarious Email Service Providers ConclusionConclusion

Origin of EmailOrigin of Email

Host Based Email SystemHost Based Email System Lan Based Email SystemLan Based Email System Attempts of interoperabilityAttempts of interoperability The rise of ARPANET mailThe rise of ARPANET mail

Email BasicsEmail Basics

What is an EmailWhat is an Email Can be as simple as Can be as simple as

a few lines of text, or a few lines of text, or include attachments include attachments such as pictures or such as pictures or documents.documents.

Email made up 75% Email made up 75% of network traffic of network traffic soon after the soon after the introduction of the introduction of the internet.internet.

Email FormatEmail Format

Message HeaderMessage Header Message BodyMessage Body

Message HeaderMessage Header

FromFrom ToTo SubjectSubject DateDate MessageIDMessageID

Message BodyMessage Body

Content EncodingContent Encoding Plain text and HTMLPlain text and HTML

How Email WorksHow Email Works

A.Sender creates and sends an emailB.Sender's MDA/MTA routes the emailC: Network CloudD: Email QueueE: MTA to MTA TransferF: Firewalls, Spam and Virus Filters

Contd…..Contd…..

Different Architectural Models exist Different Architectural Models exist for constructing computer systems.for constructing computer systems.

Some models include:Some models include: Peer-PeerPeer-Peer Client-ServerClient-Server

Contd……..Contd……..

The model that works best for email The model that works best for email is the Client-Server model.is the Client-Server model.

Clients carry out user interactions Clients carry out user interactions with the email server.with the email server.

Snail mail vs. EmailSnail mail vs. Email

Speed of DelieverySpeed of Delievery Composing of LettersComposing of Letters CostCost

Protocols usedProtocols used

IMAPIMAP POP3POP3 SMTPSMTP

Uses of EmailUses of Email

In societyIn society

-Flaming-Flaming

-Email Bankruptcy-Email Bankruptcy In BusinessIn Business

-Problem of Logistics-Problem of Logistics

-Problem of Synchronisation-Problem of Synchronisation

Problems with EmailProblems with Email

Loss of contextLoss of context Information OverloadInformation Overload InconsistencyInconsistency Attachment filesize limitationAttachment filesize limitation Information OverloadInformation Overload Spamming and Computer VirusesSpamming and Computer Viruses Email SpoofingEmail Spoofing Email BombingEmail Bombing

Contd…..Contd…..

Privacy ConcernsPrivacy Concerns

-e-mail messages are generally not -e-mail messages are generally not encrypted.encrypted.

-e-mail messages have to go through-e-mail messages have to go through

intermediate computers .intermediate computers .

-many Internet Service Providers (ISP) -many Internet Service Providers (ISP) storestore

copies of e-mail messages on their mail copies of e-mail messages on their mail servers. servers.