My company currently has an Exchange 2003 server and we are in the process of migrating to Exchange 2010. I'm to the point where I need reverse DNS setup for the new server but cannot figure out who would handle this for us. Our public IPs are from Sprint but we manage our own MX and A records through Verio. If I go to dnsstuff.com and do a reverse lookup on our current Exchange server's IP address, the nameserver that responds is from Sprintlink but when I put in a request for Sprint to setup rDNS for the new server they tell us that Verio would handle this for us. When I call Verio they say Sprint needs to set it up because they own the IP address. I can't find any internal documentation telling me who is handling the rDNS for our current Exchange server so I'm stuck in a finger-pointing loop between Sprint and Verio. Does anyone have any idea how to determine who is currently handling our rDNS so I can also have them set up the new record?