POP3 is an abbreviation for Post Office Protocol, Version 3. It is a protocol that allows a user to retrieve e-mail from a mail server by way of an Internet connection. POP e-mail is most useful for users who lack a permanent network connection since it provides a virtual "post office" (the POP server) that will hold e-mail until it can be retrieved. POP3 does not specify a particular means of writing or sending mail as this function is handled by a mail transfer protocol such as SMTP.
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