In RFC 1203, which was published in February 1991. So they created a new document of version 3 known as IMAP3. ![]() It was updated in RFC 1176, August 1990, retaining the same version. The first version of IMAP was formally documented as an internet standard was IMAP version 2, and in RFC 1064, and was published in July 1988. The result was the development of the interactive mail access protocol, which was later renamed as Internet Message Access Protocol. In the mid-1980s, the development began at Stanford University on a new protocol that would provide a more capable way of accessing the user mailboxes. So, the POP3 lacks some features which are required for the proper disconnected access model. ![]() This works, but only to a limited extent, for example, keeping track of which messages are new or old become an issue when both are retrieved and left on the server. This is implemented by using the POP3 commands that provide the option to leave the mails on the server. When developers recognized these benefits, they made some attempts to implement the disconnected access model. The mail remains on the server so different applications in the future can access it. However, the changes made to the mailboxes are synchronized between the client and the server. In the disconnected access model, the user can retrieve the mail for local use as in the POP3 protocol, and the user does not need to be connected to the internet continuously. The solution to this problem is to use the disconnected access model, which provides the benefits of both online and offline access. The POP3 also faces another issue, i.e., data security and safety. The solution to this problem is to store the mails at the remote server rather than on the local server. The biggest problem with the offline access using POP3 is that the mails are permanently removed from the server, so multiple computers cannot access the mails. In the online model, we need to be connected to the internet always. The online model we would prefer in the ideal world. Due to the offline mail access model, it cannot be used as much. Nowadays, millions of users use the POP3 protocol to access the incoming mails. It implements the offline mail access model, which means that the mails are retrieved from the mail server on the local machine, and then deleted from the mail server. POP3 is becoming the most popular protocol for accessing the TCP/IP mailboxes. Why should we use IMAP instead of POP3 protocol? Port 993: This port is used when IMAP client wants to connect through IMAP securely.Port 143: It is a non-encrypted IMAP port.Once the TCP connection is established between the IMAP client and IMAP server, the IMAP server listens to the port 143 by default, but this port number can also be changed.īy default, there are two ports used by IMAP: The IMAP protocol resides on the TCP/IP transport layer which means that it implicitly uses the reliability of the protocol. Both computers are connected through a network. On the other side, we have an IMAP server, which is also a process running on another computer. On one side, we have an IMAP client, which is a process running on a computer. ![]() It is the most commonly used protocols like POP3 for retrieving the emails. ![]() It is an application layer protocol which is used to receive the emails from the mail server. IMAP stands for Internet Message Access Protocol.
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