I have a EC2 instance setup running hMailServer. I have a primary IP on the system that I am using for example1.com email. I would like to also add a second domain example2.com using a different IP address on the same server.
I have added a secondary IP address to the instance, setup elastic IPs for both private IPs and setup MX records and A records on Route 53 to point to the proper IP addresses. I have also requested the pointers for reverse DNS from Amazon for each domain and IP.
I can send and receive email on both domains.
When I go to MXToolbox to check the SMTP settings for example2.com, it indicates that there is a reverse DNS mismatch and it shows example1.com as the name it is returning for the IP.
I assume this has something to do either with the way that Amazon maps the IPs or how they setup the reverse DNS entries.
How do I set it up so that I can get a reverse DNS match on both IPs / Domains?