I received the mail from Keypoint with the yellow sticky label indicating Return to Sender. I showed it to the post office person and I asked to speak with the supervisor. She was hailed twice, but never showed up. After the third time, the supervisor told the post office person to "take care of it". Her answer was "it was a problem with the machine -- there's nothing that can be done". So, I guess we just have to live with mail to our box getting bounced randomly. I recommend that you set up reminders in Firefox about when you expect bills so you can call the company in question so you don't get behind in your bills.