I have one Windows 2008 r2 machine with one IP Address serving up email for fourteen different domains. Not Active Directory domains, I only have one Active Directory domain, I'm just talking domains that we own the name of and want to provide email for [eg. MyCompany.com, MyCompany.net, MySideVenture.com, MyHobby.net, etc]. I have two Windows 2008 r2 servers on the outside of my network - Internet facing - which is authoritative for all of these forward lookup zones, and it has one reverse lookup zone. No, we don't use our ISP for DNS, even though that would be infinitely easier. We want the control.
How should I have my reverse lookup set up?
Should I have an A record for this email server in each forward lookup zone [eg. mail.MyCompany.com, mail.MyCompany.net, mail.MySideVenture.com, mail.MyHobby.net] and a corresponding PTR record in the reverse lookup zone for each of those A records, so that I end up having fourteen PTR records pointing to one IP Address?
Should I have only one PTR record in the reverse lookup zone pointing to the actual host name of the email server rather than "mail....."?
Need help, please. And thanks!