Post Office Protocol version 3 (POP3) allows a client to
retrieve a specific user's mail from the server. POP3 clients can
access only their server Inboxes and cannot access other public or
private folders. POP3 is not intended to provide full manipulation
of mail on the server. Although messages can be left on the server,
mail is usually only downloaded and then deleted. POP3 does not
handle sending mail. This functionality is handled by Simple Mail Transfer Protocol (SMTP).
Deploying a front-end/back-end configuration
makes it possible to manage the Internet access protocols on a
server that is separate from the one on which the store runs.
Essentially, a bank of protocol servers can handle the incoming
client connections while the store servers run the databases. The
main benefits of a front-end/back-end configuration are a unified
namespace and reduced overhead for Secure Sockets Layer (SSL)
You can configure your POP3 server to grant or
deny access to specific computers, groups of computers, or domains.
You can grant or deny access to a single computer based on an IP
address or by overriding POP3 access on a per-user basis. A group
of computers can be denied or granted access based on their subnet
address and subnet mask. You can also control access to an entire
domain by specifying a domain name. More...
You can view a list of currently connected
users. You can immediately disconnect a single user from this list
without disrupting the service of other connected users or denying
new connection requests. More...
Internet Message Access Protocol version 4
(IMAP4) and POP3 are Internet messaging protocols that allow users
to access their mail. The protocols differ in where the user
manipulates their messages. POP3 allows clients to download mail
from their Inboxes on a server to the client computer where
messages are managed. IMAP4 allows a client to access and manage
their mail on a server. IMAP4 users are not restricted to their
Inboxes like POP3 users are. IMAP4 users can also access other
public and private folders on the server where they have
There are specific performance monitors
available for POP3. They are set in System Monitor supplied with
Microsoft Windows 2000. With System Monitor, you can collect and
view extensive data about the usage of hardware resources and the
activity of POP3 virtual servers on computers you