posted 18 years ago
Either that's the wrong name for the server, or you can't get to that server from your computer. If you are sure it is the right name, then type
PING pop.unlimitedmail.org
at a command line, and see if you get similar errors there. Networking questions like this one are best handled by somebody who knows how your network is configured. This could be a DNS problem, or there could be a firewall or proxy server blocking the route, or several other things.