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'''POP3''' (''Post Office Protocol version 3'') is a [[protocol]] used to retrieve [[email|electronic mail]] (email) from an [[server|email server]].

This protocol is closely related to the [[SMTP]] protocol, where the [[SMTP]] protocol is useful for sending electronic mail from the sender's computer to the [[server]].

The [[POP3]] protocol was created because the design of the [[electronic mail]] system requires the existence of an [[email server]] that temporarily holds [[electronic mail]] until it is retrieved by the rightful recipient. The presence of an [[email server]] is due to the fact that only a small fraction of computers receiving electronic mail are continuously connected to the [[internet]].

This protocol is specified in [[RFC]] 1939.

== Example transaction ==

S = server
C = Client

C : (initialize connection)
S : +OK
C : USER wikipedia
S : +OK
C : PASS indonesia
S : +OK wikipedia have 2 messages (320 octets)
C : STAT
S : +OK 2 320
C : LIST
S : 1 150
S : 2 170
S : .
C : RETR 1
S : +OK 150
S : --email data--
S : .
C : DELE 1
S : +OK
C : QUIT
S : +OK Bye

== Related Protocols ==
* [[SMTP]] protocol for sending electronic mail
* [[IMAP4]] a protocol similar to POP3, but with more comprehensive facilities

== External links ==
* [http://www.faqs.org/rfcs/rfc1939.html RFC 1939] Post Office Protocol - Version 3

POP3 (en) - Revision history

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