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1 definition found
 for Post Office Protocol
From The Free On-line Dictionary of Computing (30 December 2018) :

  Post Office Protocol
  POP server
      (POP) A protocol designed to allow
     single-user computers to retrieve electronic mail from a POP
     server via TCP/IP.  The default port is 110.
     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.

Contact=webmaster@dict.org Specification=RFC 2229