I have a PDC that shows pdc.foobar.com as being its hostname (I guess that would be FQDN) whether I look at the properties or if I use netdom, nslookup, dns settings or active directory. However, one of my staff performed a "SuperScan" from a Linux box and got mail.whizbang.com while scanning the subnet. I cannot even find whizbang when I look through these...or even when I perform a registry scan.
Where might this value still be hiding?
One final piece of information. We are on a managed network...though the PDC is ours...we have the 10.9.53.x subnet. Could the value be in the network router that partitions us?