What is POP3?
Post Office Protocol version 3 (POP3) is a standard mail
protocol used to receive emails from a remote server to a local email client.
POP3 allows you to download email messages on your local computer and read them
even when you are offline.
(1) POP is short for Post Office Protocol, a protocol used to
retrieve e-mail from a mail server. Most e-mail applications (sometimes called
an e-mail client) use the POP protocol, although some can use the newer IMAP
(Internet Message Access Protocol).
There are two versions of POP. The first, called POP2,
became a standard in the mid-80's and requires SMTP to send messages. The newer
version, POP3, can be used with or without SMTP.
(2) Pop is short for point of presence, an access point to
the Internet. ISPs have typically multiple POPs. A point of presence is a
physical location, either part of the facilities of a telecommunications
provider that the ISP rents or a separate location from the telecommunications
provider, that houses servers, routers, ATM switches and digital/analog call
aggregators.
(3) Pop is short for Programmed Operator (POP), a
pseudo-opcode in a virtual machine language executed by an interpretive
program. The Programmed Operator instructions provide the ability to define an
instruction set for efficient encoding by calling subprograms into primary
memory.
(4) POP is short for picture-outside-picture POP is a
feature found on some televisions that allows the user to divide the screen
into two same-size pictures, enabling you to view a second program. Compare
with picture-in-picture (PIP)
Advantages of POP3
- Email is available when you are offline
- Email is not stored on the server, so your disk usage on the server is less
- Just about any email client (software) supports POP3
Disadvantages of POP3
- Can be much slower to check mail
- Much harder to do server-side filtering
- Mail is inaccessible from other machines
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