I have a 2000 server with a bunch odd DNS warnings about invalid domain name (ID 5504) I have tried a hotfix that Microsoft put out, I have tried to block any packet from this IP address at the firewall, I have also tried a couple of other things that escapes me right now. I did see an article that says there might be some e-mails on the Exchange server (Exchange2003) that might be causing this. Should I be looking at Exchange, or the DNS server for this issue?