We have done the test for open relay and we are not an open relay and yet we are still blacklisted. We have changed ip address twice (220.127.116.11 and 18.104.22.168) and still keep getting on the blacklist. How can we get off the blacklist permanently? We have scanned our users for viruses and worms and everybody is clean. We also have restricted the routing to only our internal ip address. Where is this spam coming from? Your help is appreciated.