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Reverse DNS

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3 replies

by pfreeman

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Using a Cisco 2811 w/ Static IP (T1). Emails to AOL.com are being blocked due to reverse DNS issues. Anyone had to request a PTR record for the INSIDE WAN port of the router? We have PTR records for the published static IP, but the email is being tagged be the router b4 it leaves w/ a different IP address.

Thanks,
Philip

3 replies

by bfilmfan

Do you have a MX record for your public IP address matching your domain name?

Sounds like that is the issue.

by pfreeman

Yes, we have an mx record for the mail server and 2 PTR records for the same IP (different names)...not the issue. The serial connection (T1) on the router has the .57 address, but it is set to NAT all port 25 traffic to the .58 address...but not happening.
Thanks,
Philip

by greybeard770

You may be the SOA for your domain but your ISP is the SOA for reverse lookup of the IP address block they assigned to you. Your ISP needs to create that entry for the connecting IP address which may be the public IP of your firewall or NAT device.

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