I host multiple domains on a single IP address:
cats.com A @ --> 10.20.30.40 A mail --> 10.20.30.40 MX @ --> mail dogs.com A @ --> 10.20.30.40 A mail --> 10.20.30.40 MX @ --> mail
I need to set up a PTR record for the IP address. This is so that forward-confirmed reverse DNS will succeed for other mail servers.
DNS query type PTR on 10.20.30.40 --> returns PTR-record="cats.com" (1 result) DNS query type A on "cats.com" --> returns A-record=10.20.30.40 (1 result)
If I can only have one PTR record for my IP, that points to cats.com, how will FCrDNS ever succeed for dogs.com?
Can I just use the domain name they both share (18.104.22.168.static.host.net) in the PTR ?