[wplug] Reverse DNS - PTR Record

[Ken Rambler]

I'm not sure exactly how to ask this question, so I apologize in
advance.

My question is related to the PTR record and reverse DNS of a public IP
address.

We operate a mail server and our own DNS server. The public business IP
(static) address is provided by our ISP, which is Comcast. The reverse
DNS points back to their name, i.e.:

Asking NS1.COMCASTBUSINESS.NET. for xx.xxx.xx.xx.in-addr.arpa PTR
record: Reports xx-xx-xxx-xx-pa.hfc.comcastbusiness.net
Now the question: Shouldn't the reverse point back to our server name?
Is this something we could override by adding an entry into our zone
file?
The reason I question this is that our mail looks to be forged when the
server domain name does not match the reverse dns of our IP address.

Thanks,
Ken


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