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PTR records with private IP server

thread10-1728045

PTR records with private IP server

PTR records with private IP server

(OP)
Is it possible to create a reverse lookup zone (based on the following facts) so that the queried DNS name matches the server IP address - preventing domain blacklisting?

We have decided to not use our SBS (2003) for DHCP. We discontinued ISA and installed a hardware router (between server and WAN), which does dhcp. My understanding is that the router will alter the outgoing e-mail header so that the IP address of origin is no longer matches the private IP address of the server.

Due to the high cost (here) for a static IP address, we opted for dynamic address service with addresses that persist indefinitely (port 25 out is blocked). I am the only person available to manage this server (we cannot afford an admin) and I am unable to configure ISA.

My Exchange/SBS knowledge is pretty limited. The server provides a tremendous benefit, but I am self-taught and may be ignorant of some important things. Thank you for any help with this!

RE: PTR records with private IP server

The only party that can create an RDNS address for you is your ISP, and if you have gone the dynamic IP route with them, they probably won't be willing to create an RDNS record that maps to your "temporary" IP address. If you can't get them to do that, your next best option is to get a smarthost (your ISP may provide one) to use to send your email out through. If they won't, you can use an outbound service like DNSExit or MailHop for outbound delivery--that would get you around the blacklisting issue.

Dave Shackelford
ThirdTier.net

RE: PTR records with private IP server

(OP)
Thanks, this is really helpful. Here is what I understand based on your explanation. SBS cannot do RDNS (I am assuming this is the same as reverse look up) because the "from" IP on the sent emails cannot resolve back to the server - using server-based configuration.

Godaddy hosts our domain (they confirmed they cannot help) and our ISP will not do RDNS for its residential (we are now effectively) customers. So there is only the option that you mentioned. For mail relay outbound, they list 150 relays per day for $1.50, very reasonable!

Does it make sense that I configure outbound email to use 587? Thank you again smile

RE: PTR records with private IP server

(OP)
I meant "Our domain is registered with Godaddy." We host the domain on a remote Linux machine and have the email through SBS.

RE: PTR records with private IP server

Sure, you can use 587 for outbound, shouldn't be a problem.

Dave Shackelford
ThirdTier.net

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