Question : connection refused. ip name lookup failed

I recently had to move my website to a dedicated server. Apart from the fact that I know little or nothing about running a server, things have gone quite smoothly until today when I had a couple of emails returned with the following reason:

connection refused. ip name lookup failed

What does this mean and is there something I can do to fix it from the WHM cPanel?

Thanks,
Dave

Answer : connection refused. ip name lookup failed

From webmail will do just fine :) As long as it comes from your mail server.

Chris