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POP3

POP3. POP3. Stands for Post Office Protocol – Version 3 RFC in 1993

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POP3

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  1. POP3

  2. POP3 • Stands for Post Office Protocol – Version 3 • RFC in 1993 • POP3 “is intended to permit a workstation to dynamically access a maildrop on a server host in a useful fashion. Usually, this means that the POP3 protocol is used to allow a workstation to retrieve mail that the server is holding for it.“

  3. POP3 • Doesn’t provide extensive mail operations on the server • Normally mail is downloaded, then deleted • Deletion doesn’t really occur until QUIT • Uses port 110

  4. Minimal POP3 Commands • USER name – user’s name • PASS string – user’s password • QUIT – quits, and updates the mailbox • STAT – status • LIST [msg] – lists the mail messages (#’s only) • RETR msg – retrieves a mail message • DELE msg – deletes a message • NOOP – No operation • RSET – resets the mail to its original state

  5. Example POP3 Transaction Server

  6. Establish the Socket Primary Thread Primary Thread Socket (101) Client Server

  7. Server is OK +OK POP3 server ready Primary Thread Primary Thread Socket (101) Client Server

  8. Establish the Socket USER bob Primary Thread Primary Thread Socket (101) Client Server

  9. This user is OK +OK Primary Thread Primary Thread Socket (101) Client Server

  10. Send the Password PASS ITSD4304 Primary Thread Primary Thread Socket (101) Client Server

  11. The Password is OK +OK Primary Thread Primary Thread Socket (101) Client Server

  12. Ask how the Server is Feeling… STAT Primary Thread Primary Thread Socket (101) Client Server

  13. I’m Fine, Thanks! +OK 2 320 Primary Thread Primary Thread Socket (101) Client Server

  14. Got Any Mail? LIST Primary Thread Primary Thread Socket (101) Client Server

  15. Yup… +OK 2 messages (320 octets) Primary Thread Primary Thread Socket (101) Client Server

  16. Message One 1 120 Primary Thread Primary Thread Socket (101) Client Server

  17. Message Two 2 200 Primary Thread Primary Thread Socket (101) Client Server

  18. End . Primary Thread Primary Thread Socket (101) Client Server

  19. Get Message One RETR 1 Primary Thread Primary Thread Socket (101) Client Server

  20. Message One Coming! +OK 120 octets Primary Thread Primary Thread Socket (101) Client Server

  21. Message One Coming! <the POP3 server sends message 1> Primary Thread Primary Thread Socket (101) Client Server

  22. End of Message 1 . Primary Thread Primary Thread Socket (101) Client Server

  23. Get Message One DELE 1 Primary Thread Primary Thread Socket (101) Client Server

  24. Message 1 Gone! +OK message 1 deleted Primary Thread Primary Thread Socket (101) Client Server Note: it’s not really gone…

  25. Get Message One QUIT Primary Thread Primary Thread Socket (101) Client Server

  26. QUIT – Commits/Updates +OK bob POP3 server signing off Primary Thread Primary Thread Socket (101) Client Server Note: now it’s gone

  27. Socket Disposed Primary Thread Primary Thread Client Server

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