Post Office Protocol

POP, protocol for receiving electronic mail from a central POP server (Computers)

In computing, local e-mail clients use the Post Office Protocol version 3 (POP3), an  application-layer Internet standard  protocol, to retrieve e-mail from a remote server over a TCP/IP connection. Many subscribers to individual Internet service provider e-mail accounts access their e-mail with client software that uses POP3.
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<messaging, protocol> (POP) A protocol designed to allow single user computers to retrieve electronic mail from a POP server. The POP server might be a computer with a permanent Internet connection whereas its clients might only connect to it occasionally, e.g. by modem.
There are (in 1994) three versions: POP, POP2, and POP3. Later versions are NOT compatible with earlier ones.
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(1997-03-06)

POP