To read your sample letter, give the mailx command again. Your screen will probably look something like this:
The first line identifies the version of mail that you are running; the second line indicates your mailbox, usually located in /var/mail/username, where your incoming mail is deposited. The third line in this example is the header of the letter you sent yourself. The "N" at the beginning of the line means that it's a "new" letter. A "U" (unread) means the letter was new, but was not read before quitting the mailx program previously. (The information in this screen is discussed in greater detail in "7.2 Reading Letters", in this chapter.)
Every letter is assigned a number as it is received: Rose's letter to herself is shown as letter number 1.
To read a letter, type its number at the mailx prompt, the ampersand (&), as follows: