What Is Post Office Protocol or POP3 Server?

There is also a POP3 server. POP (Post Office Protocol) is the most common protocol for retrieving e-mail from a mail server. POP is now in the 3rd version.

POP3 is an Internet standard for transferring e-mail from a server to a client (e-mail from the user) on a TCP / IP connection (usually port 110). Almost all ISPs provide an e-mail that is available via POP3.

The current version of Post Office Protocol, POP3, differs significantly from earlier versions of the POP protocol, namely POP (usually POP1) and pop2. Usually, the term “POP” referred to as the POP3 e-mail is.

POP3 and its predecessors are so that users without constant Internet connection (such as dial-up internet) their e-mail from them as they are connected to the Internet, and then the messages can view and edit without the need to the Internet to stay connected.

It is usual that a client connects to a POP3 server and retrieve all e-mails and local stores. Then the messages from the server and the connection is broken. In addition, most clients the possibility of messages on the server to leave.

This is in contrast to the more modern IMAP system that a “disconnected mode” (the POP3 method) as a “connected mode” supports. Clients who have used IMAP messages usually on the IMAP server to the server explicitly delete them. This and other properties of the IMAP system allow multiple clients accessing the same mailbox. Most e-mail programs support both POP3 and IMAP, but IMAP does not offer Internet service to.

Both the use of POP3 and IMAP for e-mails to retrieve the SMTP protocol to send e-mails. E-mail clients are often called “POP clients or IMAP clients, but in both cases for sending e-mail using SMTP.

Like many other older Internet protocols POP3 original but a way to login and that is unencrypted, with no encryption. This way the password without encryption, to the POP3 server is still widely used. Currently, POP3 different methods to log in with different security levels. It is possible to POP3 traffic using SSL to encrypt.

POP3 and Safety

POP3 protocol is a relatively unsafe, especially because nowhere in the RFC documents indicating that an account must be temporarily blocked as 3 times the wrong password is entered. This can be very simple dictionary hack password on a trial account without directly lot of notes. It is therefore advisable to choose a good password that is longer than 7 characters and not a familiar word. POP3 now gives you more assurance that your e-mails remain unread.