使用TELNET进行POP3会话

原文参考 http://techhelp.santovec.us/pop3telnet.htm 可用的命令如下

USER userid
This must be the first command after the connect. Supply your e-mail userid (this may or may not not the full e-mail address). Example: USER john.smith

PASS password
This must be the next command after USER. Supply your e-mail password. The password may be case sensitive.

The following commands may be used as needed:

STAT
The response to this is: +OK #msgs #bytes Where #msgs is the number of messages in the mail box and #bytes is the total bytes used by all messages. Sample response: +OK 3 345910

LIST
The response to this lists a line for each message with its number and size in bytes, ending with a period on a line by itself. Sample response:
+OK 3 messages
1 1205
2 305
3 344400
.

RETR msg#
This sends message number msg# to you (displays on the Telnet screen). You probably don't want to do this in Telnet (unless you have turned on Telnet logging). Example: RETR 2

TOP msg# #lines
This is an optional POP3 command. Not all POP3 servers support it. It lists the header for msg# and the first #lines of the message text. For example, TOP 1 0 would list just the headers for message 1, where as TOP 1 5 would list the headers and first 5 lines of the message text.

DELE msg#
This marks message number msg# for deletion from the server. This is the way to get rid a problem causing message. It is not actually deleted until the QUIT command is issued. If you lose the connection to the mail server before issuing the QUIT command, the server should not delete any messages. Example: DELE 3

RSET
This resets (unmarks) any messages previously marked for deletion in this session so that the QUIT command will not delete them.

QUIT
This deletes any messages marked for deletion, and then logs you off of the mail server. This is the last command to use. This does not disconnect you from the ISP, just the mailbox.

There are other POP3 commands. For some more information on this topic, see:

RFC 1939 which defines POP3 commands and error codes

How to Enable and Interpret the Pop3.log File article, which is specific to the Microsoft Internet Mail program (the logging only works with that program), but it provides general information on what goes on with a POP3 mail server.