Now you can do things with your mail. The command list will show a list of all your email, including the size of each. The command top 2 will show you the contents of email #2, while the command top 2 10 will show you the first 10 lines of email #2. The command dele 3 will delete message #3, while the command quit will log you out of your mailbox. It is very important to use the quit command, because none of the changes you make will take effect otherwise.
Another world changing tip - no doubt!
[Editor's note: I couldn't get top 2 to work; I got a "missing argument" error. But "top 2 20" and other variants worked...]