The POP3 protocol enables any email program anywhere on the Internet to connect to any email server to perform the usual email functions, such as sending and reading, as long as they have a valid account and password.
A D V E R T I S E M E N T
POP3 is an open Internet standard.
The common POP3 commands
The common POP3 commands and responses are listed in the following table:
Command
Responses
getwelcome ()
Gets the
greeting from the server.
user
(username)
Login with a
username. If valid username, server will respond with request for
password.
pass_
(password)
Send password.
If valid, server response will be two numbers, message count and mailbox
size.
stat
()
Get the mailbox
status. Response is two numbers, message count and mailbox size.
list
([message])
Get list of
messages. An option "message" gets information on a specific message.
retr
(message)
Get message
number "message".
dele
(message)
Delete message
number "message".
rset
()
Remove all
deleted message markings.
noop
()
No operation. Do
nothing. Really. Needed in unusual programming situations.
quit
()
Quit. Commits
all changes, unlocks the mailbox, and ends the server connection.
top
(message, lines)
Gets just the
first "lines" number of lines of message number "message". Useful on low
bandwidth lines to get just the first part of long messages.
uidl
([message])
Gets a unique id
list -- a message digest including unique ids. The option gets the
unique id for the specific message "message".
FTP(File Transfer Protocol)
FTP is used for transmission of data in the form of file from an application to the network.
FTP is responsible for breaking data down into IP packets before they are sent,and for assembling the packets when they arrive.
Uploading and downloading of file can be done by FTP easily.
FTP Session
An FTP session normally involves the interaction of five software elements which is given in the following table.
User Interface
This provides a user interface and drives the client protocol
interpreter.
Client PI
This is the client protocol interpreter. It issues commands to the
remote server protocol interpreter and it also drives the client data
transfer process.
Server PI
This is the server protocol interpreter which responds to commands
issued by the client protocol interpreter and drives the server data
transfer process.
Client DTP
This is the client data transfer process responsible for
communicating with the server data transfer process and the local file
system.
Server DTP
This is the server data transfer process responsible for
communicating with the client data transfer process and the remote file
system.
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