What does the pop3 service refer to in Outlook's server settings?

In the server settings of Outlook, the pop3 service refers to Post Office Protocol 3, the third version of the post office protocol. It specifies how to connect a personal computer to the Internet's mail server and the electronic protocol for downloading emails.

#The operating environment of this article: Windows 7 system, Dell G3 computer.

POP3 is the abbreviation of Post Office Protocol 3, which is the third version of the post office protocol. It specifies how to connect a personal computer to an Internet mail server and an electronic protocol for downloading e-mails.

POP is an email protocol suitable for the offline model of C/S structure. It has been developed to the third version, called POP3. The offline model cannot be operated online, and POP does not support extended operations on server emails. This process requires the more advanced IMAP4 protocol to complete. Supports POP protocol to use ASCII code to transmit data messages. These data messages can be instructions or responses.

Extended information:

POP3 has three states: AUTHORIZATION (authorization), TRANSACTION (processing), UPDATE (update).

When TCP is established, POP3 enters the "authorization" state, and the customer needs to use USER/PASS for authentication. After passing the verification, POP3 enters the "processing" state, and the customer can send LIST, RETR and other commands to query and obtain emails. When the customer After sending the "UPDATE" command in this state, POP3 enters the "update" state, and the server returns to the "authorization" state after processing the command.

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