 |
|
Please Whitelist This Site?
I know everyone hates ads. But please understand that I am providing premium content for free that takes hundreds of hours of time to research and write. I don't want to go to a pay-only model like some sites, but when more and more people block ads, I end up working for free. And I have a family to support, just like you. :)
If you like The TCP/IP Guide, please consider the download version. It's priced very economically and you can read all of it in a convenient format without ads.
If you want to use this site for free, I'd be grateful if you could add the site to the whitelist for Adblock. To do so, just open the Adblock menu and select "Disable on tcpipguide.com". Or go to the Tools menu and select "Adblock Plus Preferences...". Then click "Add Filter..." at the bottom, and add this string: "@@||tcpipguide.com^$document". Then just click OK.
Thanks for your understanding!
Sincerely, Charles Kozierok
Author and Publisher, The TCP/IP Guide
|
|
|
Custom Search
|
|
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.
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.
Command Code |
Command |
Parameters |
Description |
STAT |
Status |
None |
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. |
LIST |
List Messages |
Optional message number |
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. |
RETR |
Retrieve |
Message number |
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. |
DELE |
Delete |
Message number |
Marks a message as deleted. Once deleted, any further attempt to access a message (using LIST or RETR for example) results in an error. |
NOOP |
No Operation |
None |
Does nothing; the server just returns a +OK reply. |
RSET |
Reset |
None |
Resets the session to the state it was in upon entry to the Transaction state. This includes “undeleting” any messages already marked for deletion. |
TOP |
Retrieve Message Top |
Message number and number of lines |
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. |
UIDL |
Unique ID Listing |
Optional message number |
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. |
|
| |||||||||||||||||||
Home - Table Of Contents - Contact Us
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.