Reverse DNS (aka PTR record) is something set at your ISP level, not on your Exchange server. If you have a static IP from your provider you should be able to contact them (or log into the ISP's portal) to change the reverse DNS. If you have a dynamic IP
(meaning you didn't pay extra for a static) you will be unable to set your reverse DNS.
The implication's of not having a matching reverse DNS is that many email providers will not allow you to send them email (ex. aol.com, hotmail.com). I am actually in the same boat (on a dynamic IP) but I set up my Exchange to send all my email through a
spam filter service. If you send through a reputable spam filter you should have no issues sending to any email providers (even though reverse DNS checks will still fail).
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Proposed as answer by
Alceryes
12 hours 56 minutes ago
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Edited by
Alceryes
12 hours 56 minutes ago