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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
9 TCP/IP Post Office Protocol (POP/POP3)
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POP3 Transaction State: Mail and Information Exchange Process and Commands
(Page 1 of 2)
Once the POP3 client has successfully
authenticated the user who is performing mailbox access, the session
transitions from the Authorization state to the Transaction
state. There's no real mystery what this phase of the connection is
all about: it is where the POP3 client issues the commands that perform
mailbox access and message retrieval transactions.
POP3 Transaction Commands
Most of the commands defined in POP3
are valid only in the Transaction state. Table 257
lists each of them, in the order in which they appear in RFC 1939.
Table 257: POP3 Transaction Commands
Command
Code
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Command
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Parameters
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Description
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STAT
|
Status
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None
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Requests status information for
the mailbox. The server will normally respond telling the client the
number of messages in the mailbox, and the number of bytes of data it
contains. Optionally, more information may also be returned.
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LIST
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List
Messages
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Optional
message number
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Lists information
for the messages in a mailbox; generally this means showing the message
number and its size. If a message number is given, only that message's
information is provided; otherwise, the full contents of the mailbox
are described, one line at a time, with a line containing just a single
period at the end.
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RETR
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Retrieve
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Message number
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Retrieves a particular message
from the mailbox. The server responds with a standard +OK
message and then immediately sends the message in RFC 822 format, one
line at a time. A line with a period by itself is sent after the last
line.
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DELE
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Delete
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Message
number
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Marks a message
as deleted. Once deleted, any further attempt to access a message (using
LIST or RETR for example) results in an error.
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NOOP
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No Operation
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None
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Does nothing; the server just
returns a +OK reply.
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RSET
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Reset
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None
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Resets the
session to the state it was in upon entry to the Transaction
state. This includes undeleting any messages already marked
for deletion.
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TOP
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Retrieve
Message Top
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Message number
and number of lines
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Allows a client to retrieve only
the beginning of a message. The server returns the headers of the message
and only the first N lines where N is the number of lines
specified.
This command is optional and may not be supported by all servers.
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UIDL
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Unique
ID Listing
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Optional
message number
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If a message
number was specified, returns a unique identification code for that
message; otherwise, returns an identification code for each message
in the mailbox.
This command is optional and may not be supported by all servers.
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The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.
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