Reverse DNS with IP range from Arin

I have two PTR records already setup with my ISPs for rDNS. I also have two IP blocks from ARin.net. My email is coming/going  on this IP 1xx.2xx.1x1.xxx from Arin. This IP is nat'd back to the spam filtering appliance which in turns forwards it to the exchange server.

Example: When i email someone that checks for rDNS the IP they see is 1xx.2xx.1x1.xxx (Not the ISP IP address). how do i assign a hostname to this IP?
csltAsked:
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csltConnect With a Mentor Author Commented:
That didn't work. I am hiring a consultant to fix this issue.
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Benjamin MOREAUProject ManagerCommented:
I think you have full NAT configured (or one-to-one NAT).

So, simply ask your ISP to add a reverse DNS record on your @IP 1xx.2xx.1x1.xxx. Your ISP can add reverse DNS on all @IP that he deliver to you.
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PapertripCommented:
ARIN provides utilities for this.

Everything you should need for this can be found here.
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csltAuthor Commented:
Please close this question.
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PapertripCommented:
What didn't work exactly?

Have you delegated NS authority for your IP blocks to a nameserver you can add a PTR record to?
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PapertripCommented:
Hi, is this still an issue?
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csltAuthor Commented:
Hired a consultant
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