The READ command may be used to display envelope and header
    information for one or more queued messages. To also view the
    message content, use the /CONTENT qualifier.

    The messages to display are specified by their message
    identification numbers shown by the most recent DIRECTORY
    command. That number appears in the leftmost column of the
    DIRECTORY command listing. Ambiguous message numbers must be
    qualified by the proper channel name with the /CHANNEL qualifier.