The POP protocol allows the workstation to dynamically access mail on the mail server, which has developed to the third edition called POP3. POP3 allows workstations to retrieve messages on the mail server. The POP3 transmission process occurs between the station and the station, where the message transmitted can be an instruction or a response.
Creating a distributed email system has a variety of technical support and ways: POP (post office protocol), DMSP (hierarchical email system protocol) and IMAP (Internet Message Access Protocol). Among them, the POP protocol creation is the earliest thing to understand; DMSP has better support for "non-connection" operation, but it is largely limited to single applications (PCMAIL); IMAP provides POP and DMSP extensions And provide three support methods for remote mail access: offline, online, and not connected.
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