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|| The TCP/IP Guide|
9 TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)
9 TCP/IP Key Applications and Application Protocols
9 TCP/IP File and Message Transfer Applications and Protocols (FTP, TFTP, Electronic Mail, USENET, HTTP/WWW, Gopher)
9 TCP/IP Electronic Mail System: Concepts and Protocols (RFC 822, MIME, SMTP, POP3, IMAP)
9 TCP/IP Electronic Mail Access and Retrieval Protocols and Methods
TCP/IP Post Office Protocol (POP/POP3)
communication model used for TCP/IP e-mail
gives many options to an e-mail user for accessing his or her electronic
mailbox. The most popular access method today is the simple offline
access model, where a client device accesses a server, retrieves mail
and deletes it from the server. The Post Office Protocol (POP)
was designed for quick, simple and efficient mail access; it is used
by millions of people to access billions of e-mail messages every day.
In this section I describe the operation
of the Post Office Protocol, focusing on version 3 (POP3). I begin by
looking at the protocol in general terms, discussing its history, the
various versions of the protocol and the standards that define them.
I describe POP3's general operation and the communication between a
client and server, concentrating on the three main states through which
the session transitions. I then describe each of these states in sequence:
the Authorization state, Transaction state and Update
state. For each, I explain the communication processes that take place
and the commands and replies that implement them.
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The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
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