Ok, Thanks - I thought I might
Thanks so much for the FAST reply! I will contact my server provider and ask for reverse pointer to the server name.
The ns2.granitecanyon.com entry was just created as secondary about 12 hours ago. I added it because our other servers use the provider's DNS servers, so we can't be our own "secondary" yet... I had both name servers pointed to this server's IP address before as NS1 and NS2, which I see is not recommended.
Thanks for your work on the DNS things, I now know far more about DNS than I ever wanted to. It has to be the most difficult part of setting up a server.