XCLN: POP3 Supported Command Set for Exchange Server 5.0
ID: Q161116
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The information in this article applies to:
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Microsoft Exchange Server, version 5.0
SUMMARY
POP3 is a very simple and limited protocol. It has a set of approximately
11 commands, 10 of which are supported by Microsoft Exchange Server.
To test a POP3 connection to a Server, the user may telnet to port 110 of
the POP3 Microsoft Exchange Server computer and execute any of the
following commands.
MORE INFORMATION
Listed below are the commands along with the functionality that each command
provides.
- Command: USER
Description: Used to specify the name of the user you wish to logon as.
For TR1, it can be specified in the form of either:
USER username
-or-
USER domain\username
Additionally, if the mailbox name for the user logging on
differs from that of the username, the log on may be stated in the form of:
USER domain\username/mailboxname
- Command: PASS
Description: This is the Windows NT domain password of the user who is logging on.
Usage:
PASS password
- Command: LIST
Description: Used to list messages and their combined size. For example,
invoking the LIST command with no parameters will return 2 +OK
messages (320 octets). This means that there are two messages
in the user's mail drop taking a total of 320 octets of space.
To see an individual message simply type:
LIST N
Where N is a number between one and the number of messages
originally returned by the LIST command.
- Command: QUIT
Description: Quits the current telnet session and deletes any messages
marked for deletion.
- Command: UIDL
Description: Returns the Unique ID Listing for a message. This command
invoked in the form of either:
UIDL
-or-
UIDL N
Where N is the message number of the UIDL that the user wants to view.
Exchange Server determines this unique value in the following
fashion:
The BASE64 value of the 64-bit Message ID and then the 128 GUID for that message. If the command is invoked without arguments,
a numerical listing of all messages and their associated
UIDLs is displayed.
- Command: APOP
Description: Not Supported. APOP is an alternative method of authentication.
This is one of the optional POP3 commands.
- Command: RETR
Description: Used to Retrieve a message from the server.
Usage:
RETR N
Where N is a number between 1 and the last number returned by the
LIST command. This command may not be used to retrieve a message
that has been marked as deleted.
- Command: STAT
Description: The STAT command is similar to the LIST command in that the
server will return the number of messages in the Mail drop
along with the total space (in octets) that those messages
occupy. However, this is all the information returned by this
command. To display messages, either the RETR or LIST commands
must be invoked.
- Command: DELE
Description: This command is used to delete a message. It does not actually
delete the message but simply sets a delete flag. The message is
actually deleted when the client gracefully breaks the
connection to the server using the QUIT command. In the case
where there is a crash or immediate connection termination by
the client, the messages are not deleted.
Usage:
DELE N
Where N is the number of the message provided by the LIST command.
- Command: NOOP
Description: A Null or NO OPeration. In this case, the server does nothing.
- Command: RSET
Description: Used by the client to reset the state of messages marked for
deletion.
- Command: TOP
Description: This command is used to display both the header for a message
and a given number of lines for that message. This command is
used in the form of:
TOP XY
Where X is the message number the user wants to view and Y is
the number of lines in that message to be displayed.
The server should return the headers for the message followed by a
blank line and then the Y number of lines for that message.
- Command: AUTH
Description: This is an IMAP4 command that is part of the POP specification
from RFC1734. It allows for the use of alternative IMAP4
authorization techniques.
NOTE: A POP3 client uses standard SMTP to send messages. The POP3 command
set listed in this article is to receive messages only.
For more information on POP3, please refer to RFC 1725, RFC 1734 and RFC
1939. You can locate these and other RFCs at the
following Web site:
http://www.pmg.lcs.mit.edu/rfc.html
Additional query words:
internet eudora inbox
Keywords : kbusage XCLN exc5
Version : winnt:5.0
Platform : winnt
Issue type : kbinfo
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