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(Protocol, a method of sending and receiving data).
A POP3 session is created when a remote user connects to a mailbox on the POP3 mail
server and ends when the remote user disconnects from the POP3 mail
server.
POP3 -
Post Office Protocol
Version 3
rfc 1939 is used for delivering messages to (client) mail readers
(fetch mails from a remote mail server and store it locally).
The client sends a login (UserID) and a password to authenticate the session.
If it is accepted--the
client sends commands to retrieve messages. The server transfers the
messages and deletes them from the permanent mailbox.
By default, your POP3
clients' login to the ISP POP3 server by sending the password for the mail
account and a POP3 session is created when you (a remote user) connects to a
mailbox on your ISP POP3 mail server.
The session ends
when you (the remote
user) disconnects from your ISP POP3 mail server.
The default port on which the POP3 server listens for these requests is 110.
Client side mail readers can issue a predefined set of commands to the mail
server and access the mail.
POP3
mail server listen for mail requests
and forward mail to the requesting party.
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