Back بروتوكول مكتب البريد Arabic Post Office Protocol AST POP BE Post Office Protocol Bulgarian Post Office Protocol BS Post Office Protocol Catalan Post Office Protocol Czech Post Office Protocol CV Post Office Protocol German Post Office Protocol Greek
| The TCP/IP model (RFC 1122) |
|---|
| Application Layer |
| Transport Layer |
| Internet Layer |
| Link Layer |
In computing, the Post Office Protocol version 3 (POP3) is an application-layer Internet standard protocol used by local e-mail clients to get e-mail from a remote mail server over a TCP/IP connection. POP3 and IMAP4 (Internet Message Access Protocol) are the two most widely accepted Internet standard protocols for e-mail retrieval. Almost all modern e-mail clients and servers support both.
Many years ago, a proposal was outlined for a POP4 specification, complete with a working server implementation. The proposed POP4 extension adds basic folder management, multipart message support, as well as message flag management, allowing for a light protocol which supports some popular IMAP features which POP3 lacks. No progress has been found in the POP4 specification since 2003.