Originally Posted by easyhostmedia
Yes but the rDNS will relay to the server as rDNS is set up using the IP address and server hostname, but if a server has say 3 accounts using dedicated IPs and all want rDNS set up then these can conflict with each other as they are on the same server.
It doesn't work like that.
rDNS is just like forward DNS but instead of taking a name and turning it into a number, it takes a number and turns it into a name. Hence r
DNS or Reverse
rDNS doesn't care whether it's a shared server, dedicated IP, etc. The only reason having a dedicated IP would be 'important' in any sense is so that other clients on the same IP aren't put under a custom rDNS record that doesn't apply to them.
Realistically the only times rDNS are really necessary are when you're sending email from an IP - such as on a VPS, Dedicated, or Cloud Server.