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POP3 (Post Office Protocol 3) is a simple, client‑initiated protocol for retrieving email from a remote mail server. It provides basic download-and-remove semantics, is resource-efficient but functionally limited, and requires additional configuration for secure authentication and transport encryption in modern deployments.
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Post Office Protocol 3 (POP3) is an Internet protocol that lets a mail client retrieve messages from a mail server.
POP3 grew from early Internet mail standards as a simple retrieval protocol. The third version was standardised as RFC 1939; later extensions and secure transports build on the base mechanism.
The client connects, authenticates, lists messages, downloads them, and ends the session. Depending on configuration, the server deletes messages or retains them. POP3 does not synchronise a rich folder and state model across devices.
The server-side store from which a POP3 client retrieves messages.
The connection in which client and server list and transfer messages.
An option that retains retrieved messages for other clients.
POP3 helps classify older or simple mail setups. IMAP is usually better for multi-device synchronisation and server-side folders; transport encryption and authentication must be configured separately.
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