This is a protocol for fetching e-mail from a mail server. This method was designed to retrieve mail from a remote mail server and store the e-mail locally. Mail fetched via POP3 typically gets removed from a server once your e-mail client has fetched the mail (though you can change this behavior). Since mail is removed from the server, you typically can only read old mail in the e-mail program used to download the messages. If your mail server goes down, you will still be able to access old mail locally without an Internet connection.
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