Multtiple domains hosted through one exchange server

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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Glen KnightCommented:
You would normally use the hostname that matches the A record used by your MX record.

This would be thecsame for all domains and therefore prevent the mismatch.

So for example your MX would point to and this would be used for all domains.
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