Post Office Protocol (POP3)

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In computing, the Post Office Protocol (POP) is an application-layer Internet standard protocol used by local e-mail clients to retrieve e-mail from a remote server over a TCP/IP connection.[1] POP and IMAP (Internet Message Access Protocol) are the two most prevalent Internet standard protocols for e-mail retrieval.[2] Virtually all modern e-mail clients and servers support both. The POP protocol has been developed through several versions, with version 3 (POP3) being the current standard.


  1. Dean, Tamara (2010). Network+ Guide to Networks. Delmar. pp. 519 - ISBN 061921743X.
  2. Komarinski, Mark (2000). Red Hat Linux System Administration Handbook. Prentice Hall. pp. 179 - ISBN 0130253952.