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POP3    
Version 3 of the {Post Office Protocol}.
POP3 is defined in {RFC 1081}, written in November 1988 by
Marshall Rose, which is based on RFC 918 (since revised as RFC
937). POP3 allows a {client} computer to retrieve {electronic
mail} from a POP3 {server} via a (temporary) {TCP/IP} or
other[?] connection. It does not provide for sending mail,
which is assumed to be done via {SMTP} or some other method.

POP is useful for computers, e.g. mobile or home computers,
without a permanent network connection which therefore require
a "post office" (the POP server) to hold their mail until they
can retrieve it.

Although similar in form to the original POP proposed for the
{Internet} community, POP3 is similar in spirit to the ideas
investigated by the {MZnet} project at the University of
California, Irvine, and is incompatible with earlier versions
of POP.

Substantial work was done on examining POP in a {PC}-based
environment. This work, which resulted in additional
functionality in this protocol, was performed by the {ACIS}
Networking Systems Group at {Stanford University}.

RFC 1082 (POP3 Extended Service) extends POP3 to deal with
accessing mailboxes for {mailing lists}.

(1997-01-09)


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  • What is POP3 (Post Office Protocol Version 3)? - GeeksforGeeks
    The Pop client makes use of POP to pull email messages from the POP server POP3 is the updated version of POP What is POP3? POP 3 stands for Post Office Protocol Version 3 POP3 protocol is used to provide access to the mail inbox that is stored in the email server POP3 protocol can download and delete messages
  • Post Office Protocol - Wikipedia
    In computing, the Post Office Protocol (POP) is an application-layer Internet standard protocol used by e-mail clients to retrieve e-mail from a mail server [1] Today, POP version 3 (POP3) is the most commonly used version Together with IMAP, it is one of the most common protocols for email retrieval
  • What Are Email Protocols - POP3, SMTP and IMAP - SiteGround
    Email protocols are the underlying mechanism of email transactions Learn more about how they operate, and what are the default email ports
  • Post Office Protocol Version 3 (POP3): Complete guide - Twilio
    Learn how POP3 works, what ports it uses, and why it matters for your email Our complete guide breaks down this must-know protocol in simple terms
  • Differences between POP3 and IMAP - GeeksforGeeks
    POP3 (Post Office Protocol 3) downloads emails to the client device and typically removes them from the server IMAP (Internet Message Access Protocol), on the other hand, keeps emails on the server and synchronizes them across multiple devices, making it ideal for users who access email from multiple locations
  • POP3 Explained [2026] - Mailtrap
    POP3, or Post Office Protocol version 3, is an Internet standard protocol that retrieves email messages from a server over a TCP IP connection It’s the third version of the Post Office Protocol 3, which is defined in RFC 1939
  • Email Protocols Guide: POP3, SMTP IMAP Settings and Ports Explained
    Learn about email protocol types (POP3, SMTP and IMAP), their default ports, and the different email transport protocols
  • What Is POP3? Understanding Email Retrieval Protocols
    POP3 is an abbreviation for Post Office Protocol 3, and it is the third version of a widespread method of receiving email An email protocol is the programmed system of defined rules that govern the exchange of emails between servers and email clients The reason that your emails arrive with consistency is because of your email protocol Should you use POP3, or is one of the other protocols
  • What does POP3 mean? POP3 protocol explained simply
    Learn what POP3 stands for, how the POP3 protocol works, which ports it uses, and when POP3 still makes sense versus IMAP





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