Connecting to Mailbox on Gmail and Fetching List of Emails using POP3

In this tutorial, we will learn about Post Office Protocol (POP3). It is a protocol (a set of commands) used by an email client to connect to and retrieve email(s) from the mailbox on the remote server. We will develop the code that connects to the POP3 server and sends commands to retrieve the list of emails on the server, and then later, using an ASP.NET page, displays the list to the user. To demonstrate the code, we will be connecting to Gmail's POP3 server using SSL (Secure Sockets Layer).