Oct 25 02:28:24  nullmailer[1947]: Starting delivery: protocol: smtp host: mail.arcor.de file: 1287965353.1976
Oct 25 02:28:25  nullmailer[2159]: smtp: Failed: 550 5.1.8 <root@defaulthost.defaultdomain>: Sender address rejected: Domain not found
Oct 25 02:28:25  nullmailer[1947]: Sending failed:  Permanent error in sending the message
Oct 25 02:28:25  nullmailer[1947]: Delivery complete, 2 message(s) remain.