PRESENTATION

Name: Muhammad Ahsan Sajjad

Subject: Computer Networks

Topic: How Email Works

EXECUTIVE SUMMARY

This report is about how email works, when we send an email where it is stored and how it delivered to desired person, which transportation path is followed by email to reach its destination and how we can trace an email where it came from.

INTRODUCTION

What Is Email? How Email System Works? The server

HOW EMAIL REALLY WORKS?

Sender creates and sends an email Sender's MDA/MTA routes the email Network cloud Email queue MTA to MTA transfer DNS resolution and transfer process Firewalls, spam and virus filters Delivery   RFCs

FIGURE-1 HOW EMAIL WORKS

PROTOCOLS THAT ARE USED

POP3 (Post Office Protocol 3) SMTP (Simple Mail Transfer Protocol) IMAP (Internet Message Access Protocol) MIME (Multipurpose Internet Mail Extensions)

EMAIL MESSAGE TRANSPORT

Incoming mail server (POP3, IMAP, HTTP) Outgoing mail server (SMTP)

Thanks