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POP3 (Post Office Protocol 3) is a protocol that provides a simple, standardized way for users to access mailboxes and download messages to their computers. One of the most used mail-protocols on the Internet.

Currently, POP3 (POP version 3) is the latest version. POP is a protocol for receiving email from a remote host in a single batch; it is best suited for non-interactive mail retrieval, where email is finally stored on the client computer. A competing protocol is imap.

The POP3 protocol runs on TCP port 110.

POP3 daemons

POP3 examples