how email works?

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full description how it will works.

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Slide 1: 

BY, SHAIK.KHADARVALI, WELCOME TO THE SEMINAR HOW EMAIL WORKS

Slide 2: 

WHAT IS E-MAIL . DIFFERENT E-MAIL PROVIDERS. WHAT MAKES UP AN E-MAIL. DIFFERENT ARCHITECTURAL MODELS. HOW E-MAIL REALLY TRAVEL. BOUNCING OF E-MAIL. THREATS TO E-MAIL. OVERCOMING THREATS. CONCLUSION. OVERVIEW

WHAT IS E-MAIL : 

WHAT IS E-MAIL Electronic mail, often abbreviated as email or e-mail. Email – an electronic message transmitted over a network from one user to another. Can be as simple as a few lines of text, or include attachments such as pictures or documents. It is the method of exchanging digital messages between two or more systems. E-mail systems are based on a store-and-forward model. In which e-mail computer server systems accept, forward, deliver and store messages on behalf of user.

WHAT IS E-MAIL : 

WHAT IS E-MAIL The first email systems were developed at SCD and MIT in 1965. Incompatible with each other, each system was designed to facilitate message delivery between users on a single machine. Ray Tomlinson invented email back in 1971 – essentially fostering global business communication. It is the easy & cheapest comm.

DIFFERENT E-MAIL PROVIDERS. : 

DIFFERENT E-MAIL PROVIDERS. Now a days there many e-mail providers. Gmail. Yahoomail. Rediffmail. Hotmail &etc.

WHAT MAKES UP AN E-MAIL. : 

WHAT MAKES UP AN E-MAIL. Internet e-mail messages consist of two major sections: Header — Structured into fields such as summary, sender(from), receiver(to), subject, date , cc ,Bcc, reply, message-id about the e-mail. Body — The message itself as unstructured text; sometimes containing a signature block at the end. This is exactly the same as the body of a regular letter.

DIFFERENT ARCHITECTURAL MODELS. : 

DIFFERENT ARCHITECTURAL MODELS. Different Architectural Models exist for constructing computer systems. Some models include: Peer-Peer Pipe and Filter Implicit Invocation Client-Server

DIFFERENT ARCHITECTURAL MODELS. : 

DIFFERENT ARCHITECTURAL MODELS. The model that works best for email is the Client-Server model. Clients carry out user interactions with the email server.

Slide 9: 

An email client is an email program such as Outlook Express, for sending, receiving and organizing your email messages. Email servers are used to process, store and send, and receive email messages. There are different types of email servers, such as POP 3, SMTP and IMAP servers. The most popular email servers are POP 3 (incoming mail servers for your incoming mail) and SMTP (outgoing mail servers for your outgoing mail). CLIENT-SERVER MODEL

HOW E-MAIL REALLY WORKS : 

HOW E-MAIL REALLY WORKS Step A: Sender creates and sends an email The originating sender creates an email in their Mail User Agent (MUA) and clicks 'Send'. Step B: Sender's MDA/MTA routes the email The sender's MUA transfers the email to a Mail Delivery Agent (MDA). Frequently, the sender's MTA also handles the responsibilities of an MDA. The MDA/MTA accepts the email, then routes it to local mailboxes.

HOW E-MAIL REALLY WORKS : 

HOW E-MAIL REALLY WORKS Step C: Network Cloud The network cloud may encompass a multitude of mail servers, DNS servers, routers and other devices and services too numerous to mention. These devices may be protected by firewalls, spam filters and malware detection software that may bounce or even delete an email. Step D: Email Queue so it enters an email queue with other outgoing email messages.

HOW E-MAIL REALLY WORKS : 

HOW E-MAIL REALLY WORKS Step E: MTA to MTA Transfer When transferring an email, the sending MTA handles all aspects of mail delivery until the message has been either accepted or rejected by the receiving MTA. Step F: Firewalls, Spam and Virus Filters An email encountering a firewall may be tested by spam and virus filters before it is allowed to pass inside the firewall. If the message contains malware, the file is usually quarantined and the sender is notified. If the message is identified as spam, it will probably be deleted without notifying the sender.

BOUNCING OF E-MAIL. : 

BOUNCING OF E-MAIL. Due to the following reasons e-mail will bounce. Mailbox Not Found, invalid mailbox, Mailbox unavailable, Mailbox full, Host unknown. A sending MTA can encounter two general kinds of problems transferring an email: transient or permanent failures. transient failures:-If a transient error occurs, the MTA will hang onto the message, periodically retrying the delivery until it either succeeds or fails, or until the MTA decides that the transient issue is really a permanent condition. permanent failures:-If the MTA cannot deliver the message (it has received a fatal error message or failed to complete the transfer after repeated attempts), it bounces the message back to the sender.

THREATS TO E-MAIL : 

THREATS TO E-MAIL E-mail spoofing occurs when the header information of an email is altered to make the message appear to come from a known or trusted source. E-mail bombing is the intentional sending of large volumes of messages to a target address. The overloading of the target email address can render it unusable and can even cause the mail server to crash.

OVERCOMING THREATS : 

OVERCOMING THREATS E-mail messages have to go through intermediate computers before reaching their destination. many Internet Service Providers (ISP) store copies of e-mail messages on their mail servers before they are delivered. Using encryption techniques.

CONCLUSION : 

CONCLUSION There are many uses of e-mail in our daily life. We should not misuse the e-mail for illegal activities. We should have our own moral values. THANK U SEE U AGAIN

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