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Encyclopedic overview
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In computing, the Post Office Protocol (POP) is an application-layer Internet standard protocol used by e-mail clients to retrieve e-mail from a mail server. Today, POP version 3 (POP3) is the most commonly used version. Together with IMAP, it is one of the most common protocols for email retrieval.
Excerpted from Wikipedia’s “Post Office Protocol” article, available under the CC BY-SA 4.0 licence.