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I am hosting multiple domains through one Exchange Server. I have a miss match on my reverse DNS. I am not sure what domain I should use to have my ISP match to my reverse DNS. Should I be using the domain name of the server? 
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I am hosting multiple domains through one Exchange Server. I have a miss match on my reverse DNS. I am not sure what domain I should use to have my ISP match to my reverse DNS. Should I be using the domain name of the server? 

Multtiple domains hosted through one exchange server

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.