Complete Protocol dictionary, glossary and reference
POP: Post Office Protocol
The Post Office Protocol(POP) is designed to allow a workstation with an email client to dynamically access a mail drop on a server host over the TCP/IP network. POP3 is the version 3 (the latest version) of the Post Office Protocol, which has obsoleted the earlier versions of the POP protocol: POP1 and POP2. POPs are not intended to provide extensive manipulation operations of mail on the server; normally, mail is downloaded and then deleted.