All mail files are subdivided into folders. By default, your mail
    file (MAIL.MAI) contains a folder named MAIL. The MAIL folder
    contains messages that you have already read. New mail messages
    automatically enter a folder named NEWMAIL, unless the recipient's
    folder name is specified by the send item code using external
    mail program to send the mail. After you read the messages in the
    NEWMAIL folder, Mail moves them into the folder named MAIL. The
    NEWMAIL folder disappears after you have read all new mail messages
    and either select another folder or exit from Mail.

    A folder name can be 1 to 39 characters in length. Valid
    characters for folder names are alphanumeric characters, dollar
    signs ($), and underscores (_). If your folder name contains
    lowercase letters, spaces, or special characters, the folder name
    must be enclosed in quotation marks (" ").

    When you delete a message, Mail moves it into the WASTEBASKET
    folder. Deleted messages collect in the WASTEBASKET folder until
    you empty it. To empty the WASTEBASKET folder, enter either the
    EXIT command (if AUTO_PURGE is set) or the PURGE command. If
    there are no deleted messages, you will not see a WASTEBASKET
    folder.

    You can create as many folders as you want. You can use the COPY,
    FILE, or MOVE command to create folders. Mail displays the name
    of the folder that you are currently in at the top right corner
    of the screen when you enter the READ or DIRECTORY command.
    You can enter the DIRECTORY/FOLDER command to see a display of
    the existing folders in the current mail file. You can remove
    a folder by deleting all the messages it contains. Enter HELP
    DELETE at the MAIL> prompt for more information on deleting
    messages.