This is getting old... ConnectSafe (aka NortonDNS) is now blocking the following email server:
utopiasystems.net.mx1.utopia.rcimx.net
This server appears to be an anti-spam email filter service (just from performing a whois), so, I suspect a lot of email is being blocked.
We're using the 199.85.126.10 norton dns servers as forwarders in windows server dns service. The error was noticed because our email server (exchange 2007) could not connect to the above email server. As soon as i changed to google's dns servers, it connected imediately. i verified using telnet to port 25...
Sorry to say, but, it seems you get what you pay for in this instance.
bill