Radiant.net incoming server not working in Mail 6.3
Just recently got a computer with 10.8 Mountain Lion. Upgraded from a "17 macbook pro with Leopard. I use mail from Radiant.net and it has always worked. Now on my new computer it doesn't seem to be working. It accepts most everything but rejects the incoming server. I have been at the apple store and tested on one of their computers, but it still doesn't seem to work. I have contacted them and followed their steps and still no success. Is mountain lion not compatible?
MacBook Pro with Retina display, OS X Mountain Lion (10.8.4), Mail 6.3