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Explain what POP3 is
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In computing, Post Office Protocol version 3 (POP3) is an application layer Internet standard protocol that a local client uses to retrieve email from a remote server over a TCP/IP connection. Nearly all subscribers to individual Internet service provider email accounts access their email with clients that use POP3.
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others have answered your "What is SMTP and what is POP3" questions.. . Here's what you are really looking for.. the SETTINGS for pop3 and SMTP for Yahoo mail:. .
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