Email Systems and Protocols: SMTP, MIME, POP3, IMAP, Slides of Computer Networks

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MAIL PROTOCOLS: SMTP

MIME POP3 IMAP

EMAIL

• The first email systems simply consisted by file transfer protocols.
• Email Architecture and Services

i. User agents: They allow the people to read and send e–

mail.

ii. Message transfer agents: They move the messages from

the source to destination.

EMAIL ENVELOPE

• An email envelope contains the message, destination address, priority, security level etc.
• Message:
• The actual message inside the envelope is made of the following two parts:
• (i) Header: Carries the control information
• (ii) Body: Contains the message contents

MAIL ACCESS PROTOCOLS

• There are two mail access protocols being used as under:
• (i) Post office protocol^ -^ POP version 3^ POP 3
• (ii) Internet Message Access Protocol Version 4 IMAP 4

MODES OF POP

• POP3 has the following two modes:
• (i) Delete mode, and
• (ii) Keep mode Delete mode: Mail is deleted from the mailbox after each retrieval. Keep mode: Mail remains in the mailbox after retrieval. This mode is used when the user access mail away from the primary computer

IMAP

• Internet Mail Access Protocol Version 4
• Has more features than POP
• More powerful but more complex
• Extra features:
• 1.^ Possible for the user to check the header before downloading
• 2. Possible for the user to search for the contents of E-mail before downloading
• 3.^ Possible for the user to create, rename or delete mailboxes on the mail server
• 4. Possible for the user to create a hierarchy of mailboxes in a folder for e–mail storage

REFERENCES

• A course in computer networks
  • – Dr. Sanjay Sharma (Katson books)

CONCLUSION