Whenever I restart the Internet Mail service I get a warining for Event ID 3040: Unable to resolve a delivery route. The route lists smtp.dial.pipex.com (our outgoing mail host) as the target host, but the address for smtp.dial.pipex.com could not be resolved.

I don't know where it's picking this up from, I've checked with our ISP and it is the right address - have I done something fundamentally wrong?

I can't send mail, it doesn't want to know.
All advice glady received.