protected function _deleteMailboxPost(Horde_Imap_Client_Mailbox $mailbox)
    {
        /* Delete mailbox caches. */
        if ($this->_initCache()) {
            $this->_cache->deleteMailbox($mailbox);
        }
        unset($this->_temp['mailbox_ob'][strval($mailbox)]);

        /* Unsubscribe from mailbox. */
        try {
            $this->subscribeMailbox($mailbox, false);
        } catch (Horde_Imap_Client_Exception $e) {
            // Ignore failed unsubscribe request
        }
    }