Quote:
Originally Posted by bhwong  ... a rDNS on my IP address will get resolve to my domain instead of all my customers domains and fail the rDNS test for my customer PTR records... |
That's no problem. An rDNS check is only meant to check IF there's a PTR record present, it doesn't validate this PTR record against DNS, since that would make it impossible to host multiple emaildomains on 1 ip-address.
Background: most open spam-relays (hacked home computers) do not have a PTR record. A rDNS check is therefore a "quick & easy" way of spam-filtering.