Post Office Protocol (POP) is an application-layer Internet standard protocol used by local email clients to retrieve emails from a remote server over a TCP/IP connection. POP3, the most recent version, allows users to download messages to their local device and optionally delete them from the server, making it suitable for offline email access.

Post Office Protocol

application-layer Internet standard protocol

local email clients

remote server

TCP/IP connection

POP3, or Post Office Protocol version 3, is a standard mail protocol used to retrieve emails from a remote server to a local client, allowing users to download and manage their emails offline. It operates over TCP/IP and typically uses port 110, with the option of secure communication through SSL/TLS on port 995.

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