POP3 is popular among many ISPs because it is designed so that messages are downloaded to an inbox on the client's computer, rather than being stored on the e-mail server after they are accessed.

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POP3 protocol is designed to download emails from a mail server to a client's computer and store them in an inbox on the computer. This allows for efficient use of server resources and faster access to messages for the client.

POP3 Is Popular Among Many ISPs Because It Is Designed