POP3 Authorization State: User Authentication Process and Commands
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A session between a POP3 client and a POP3 server begins when the client sends a TCP connection request to the server. The connection is established using the standard TCP three-way handshake, and the POP3 session commences. The first of the three states of a POP3 session is the Authorization state, which is responsible for authenticating the POP3 client with the server.
When the session first enters this state, the server sends a greeting message to the client. This tells the client that the connection is alive and ready for the client to send the first command. An example of such a greeting would be:
+OK POP3 server ready
The client is now required to authenticate the user who is trying to access a mailbox. This both proves that the user has the right to access the server, and identifies the user so the server knows which mailbox is being requested.
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