/RECIPIENT[=options]

    Optional. Default: ALL.

    Used with /FULL, displays selected recipient classes. Available
    options include the following:

    ALL        Shows failed, sent, and unsent mail messages.
    FAILED     Shows messages that could not be read for a particular
               recipient.
    SENT       Shows successful deliveries to a particular recipient.
    UNSENT     Shows messages that are as yet unsent.