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Post Office Protocol

Family of Internet mail protocols Post Office ProtocolCommunication protocolOSI layerApplication layerIP numberTCPPorts110 (unencrypted)995 (secured over TLS/SSL)RFCs1939 (Current)2449 (Extension Mechanism)5034 (SASL Authentication) 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.

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