The Post Office Protocol (POP) is an application-layer Internet standard protocol used by email clients to retrieve email from a mail server. POP version 3 (POP3) is the most commonly used version. Together with IMAP, it is one of the most common protocols for email retrieval.
History[]
The first version of the Post Office Protocol, POP1, was specified in RFC 918 (1984) by Joyce K. Reynolds. POP2 was specified in RFC 937 (1985).
POP3 is the most commonly used version. It originated with RFC 1081 (1988) but the most recent specification is RFC 1939, updated with an extension mechanism (RFC 2449) and an authentication mechanism in RFC 1734. This led to a number of POP implementations such as Pine, POPmail, and other early mail clients.
POP4[]
POP4 exists only as an informal proposal adding basic folder management, multipart message support, as well as message flag management to compete with IMAP; however, its development has not progressed since 2003.
Purpose[]
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