(POP commands used: STAT, LIST, UIDL, TOP).ģ) After establishing the new messages list, email client proceeds with the download, one message at the time. POP can only check the contents of your Inbox folder messages and that is the only folder it can access usually. The server replies with the list of messages and their unique identifiers. (POP commands used: USER, PASS, APOP).Ģ) Then it examines the list of messages the server offers and figures out which ones are new. The lock is there to prevent 2 computers to access the mailbox at the same time as POP is not designed for that. At that moment, the mailbox on the server is locked and you cannot access it from an another computer or device – POP protocol specifies that another connection is disallowed, while the current one is in use. How does POP work?ġ) First, an email client connects to the server and authenticates with the username and password you put into its account settings. It is also possible to keep emails on the server but more on that later. POP, which stands for Post Office Protocol is the older and simpler of the two protocols and it is designed with a simple goal of fetching emails off of a server by a single email client and then removing them from the server. Now, do not be confused by the name POP3 as that is also just POP, just with the number 3, which indicates the version of the protocol (before POP3 there were POP1 and POP2 which are no longer in use today). To communicate, both the client and the server must agree on a common standard, or protocol – and POP and IMAP are the names of these protocols, and they represent a set of commands (or a vocabulary if you will), designed to make it possible for the client and the server to understand each other. In reality, it is a bit more complicated than that, but that is the general idea. Post offices (email servers) communicate between themselves to send emails and finally a postman on the other end (another email client) fetches the mail from another post office. The postman (email client) goes to the post office (email server) to fetch some emails. Think of it as a postman and a post office. As email is a two-part system, the first part being an email program which you install on your computer, tablet or smartphone, called the email client, and the second part being the email server. What is the difference?įirst off, both POP and IMAP are email protocols designed to fetch emails from a server. So, you’ve got your nice little email program (such as OE Classic), and you want to configure an email account and it offers you a choice between POP (or POP3) and IMAP but you don’t know which one to choose. At last, perfect replacement for Outlook Express and Windows Live Mail is available, called OE Classic - Click here to download!
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