I have a server on Amazon (Apache2/ubuntu server). I am using it to host a handful of websites. Although all the sites use gmail or other external mail providers to send and receive email I have mail setup on the server because I need the server to be able to send password forget emails and other basic emails that also would not be needing to be sent so often.
With that I also need to ensure the emails dont get blocked or go to spam folder. So I need a rDNS record setup.
My question is the server hosts like 5 different hosting accounts each with there own domain name and everyone just sets an A record to point their domain to the server. So I have no nameservers setup or any domain like that setup on the server just all the client domains.
Also I do not have access to each of the client domain names and do not want to have to use route53 could I setup the reverse dns on the ec2 server itself or on my Godaddy account where I have my domain registered?
Looking for advice thank you.