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Carl BillingtonFlag for Australia asked on

Reverse DNS on multiple domains with one Internet connection

I regularly use two different domains to send and receive mail in our organisation.

Example.com.au
Example.edu.au

I found that some clients often did receive our emails so I configured reverse DNS with Example.com with our ISP. As soon as I did that the issue was resolved.

I wanted to setup reverse DNS on our other domain Example.edu.au but our ISP said that we can only setup reverse DNS on one domain.

As a result, we purchased addition IP addresses for our internet connection and configured reverse DNS on another IP address that we have been allocated..

My question is;

Do I need to change the MX record on Example.edu.au to point to the IP address that we configured reverse DNS on? Or doesn’t it matter as it is on the same internet connection?
DNSNetworkingRouters

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Last Comment
pradeep7880

8/22/2022 - Mon
lucifer82

If the Exchange that is hosting is using the same IP address it should be fine to leave it in the same MX record.
TazDevil1674

In the past, I have maintained an Exchange System thats utilised 6 Domains, we only every had a single IP for Exchange and used the primary domain name as part of the rDNS.

If you look at hosted exchange solutions - the rDNS on their system will be their own - none of the cusomters' domains will be mentioned.


A second Public IP wouldnt be important.
SOLUTION
Kerem ERSOY

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ASKER
Carl Billington

The reason I ask is that some of our clients don't receive emails from our example.edu.au domain. It was exactly the same issue we had with example.com domain before we setup rDNS with our ISP. So I need to setup rDNS on our second domain. Just need to make sure I'm doing it correctly

Yes we use Microsoft exchange
Your help has saved me hundreds of hours of internet surfing.
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pradeep7880

Cannt you use a Alias in DNS? like CNAME?