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Electronic Mail

Electronic Mail. Architecture and Services The User Agent Message Formats - MIME Message Transfer - SMTP Final Delivery POP3 IMAP. Electronic Mail (2). Some smileys. They will not be on the final exam :-). Architecture and Services. Basic functions Composition Transfer Reporting

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Electronic Mail

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  1. Electronic Mail • Architecture and Services • The User Agent • Message Formats - MIME • Message Transfer - SMTP • Final Delivery • POP3 • IMAP

  2. Electronic Mail (2) Some smileys. They will not be on the final exam :-).

  3. Architecture and Services Basic functions • Composition • Transfer • Reporting • Displaying • Disposition

  4. The User Agent Envelopes and messages. (a) Paper mail. (b) Electronic mail.

  5. Reading E-mail An example display of the contents of a mailbox.

  6. Message Formats – RFC 822 RFC 822 header fields related to message transport.

  7. Message Formats – RFC 822 (2) Some fields used in the RFC 822 message header.

  8. MIME – Multipurpose Internet Mail Extensions Problems with international languages: • Languages with accents (French, German). • Languages in non-Latin alphabets (Hebrew, Russian). • Languages without alphabets (Chinese, Japanese). • Messages not containing text at all (audio or images).

  9. MIME (2) RFC 822 headers added by MIME.

  10. MIME (3) The MIME types and subtypes defined in RFC 2045.

  11. MIME (4) A multipart message containing enriched and audio alternatives.

  12. Message TransferSMTP – The Simple Mail Transfer Protocolport 25 Transferring a message from elinore@abc.com to carolyn@xyz.com.

  13. Sequence of Mail Gateways store and forward email messages Mail Mail gateway Mail reader reader Mail Mail Mail daemon daemon daemon SMTP/TCP SMTP/TCP

  14. Final Delivery (a) Sending and reading mail when the receiver has a permanent Internet connection and the user agent runs on the same machine as the message transfer agent. (b) Reading e-mail when the receiver has a dial-up connection to an ISP.

  15. POP3 (Post Office Protocol Version 3) Using POP3 to fetch three messages.

  16. IMAP (Internet Message Access Protocol) A comparison of POP3 and IMAP.

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