E mail flow


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This Presentation explains,the background process of mails sending and receiving.

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E mail flow

  1. 1. E-MAIL FLOW
  2. 2. Topics • What is an E-Mail? • How it works? • Types of Protocols • Mail Clients • Question & Answers
  3. 3. What is e-mail? • Electronic mail, most commonly referred to as email or e-mail. • It is a method of exchanging digital messages from sender to one or more recipients. • Early email systems required both the sender and receiver should be online, now that is called as “Instant Messaging.” • Today’s email system is based on a “Store-and-forward” model.
  4. 4. Email Format • It consists of 3 parts: i) Sender and Recipient address ii) Subject line iii) body
  5. 5. How email flows?
  6. 6. Protocols • Simple Mail Transfer Protocol (SMTP) • Internet Message Access Protocol (IMAP) • Post Office Protocol 3 (POP3)
  7. 7. Protocols • SMTP (Simple Mail Transfer Protocol): It is a connection-oriented, text based protocol, communicates with a mail sender and mail receiver by issuing commands. SMTP transaction consists of 3 commands: i) MAIL command, to establish the return address i.e., sender ii) RCPT command, to establish a recipient of the message. iii) DATA to send the message . SMTP Server connects to by looking up the MX (Mail Exchange) DNS resource and connects to it. SMTP uses TCP port 25
  8. 8. Protocols • Internet message access protocol (IMAP) is a protocol for e-mail retrieval. • IMAP server listens on well-known port 143. • IMAP is an Application Layer Internet protocol that allows an e-mail client to access e-mail on a remote mail server. • E-mail clients using IMAP generally leave messages on the server until the user explicitly deletes them. • Incoming e-mail messages are sent to an e-mail server that stores messages in the recipient's e-mail box. The user retrieves the messages with an e-mail client that uses one of a number of e-mail retrieval protocols.
  9. 9. Protocols • Post Office Protocol 3 (POP3) is a protocol for e-mail retrieval. • POP3 is an application-layer Internet standard protocol used by local e-mail clients to retrieve e-mail from a remote server over a TCP/IP connection. • POP supports simple download-and-delete requirements for access to remote mailboxes. • A POP3 server listens on well-known port 110.
  10. 10. Email Clients Locally installed Clients: • Microsoft Outlook • Mozilla Thunder Bird • IBM Lotus Notes Web based Mail Clients: • Gmail • Yahoo Mail • Mail.com • Outlook.com
  11. 11. Q&A