I'm trying to monitor an arcserve backup with an IMAP sensor. But the trouble is that the sensor reads only the last message in the inbox. So, if only one in lots of backup jobs fails, the sensor gets down, but it gets up again when an e-mail of a successfull job arrives, so we'll keep unaware of the failure. It would be better if the sensor keeps down until I remove the failure message of the Inbox. How can I do that?