[thelist] mail server problems

[Anthony Baratta]

Who ever is your ISP needs to set that up. They are normally in charge of the DNS that would give your IP address a host name. So they can set it up.

Here is more detail on the issue for you to give them:

Preparation:
The  reverse DNS entry for an IP is found by reversing the IP, adding it to "in-addr.arpa", and looking up the PTR record.
So, the reverse DNS entry for 208.101.58.178 is found by looking up the PTR record for
 178.58.101.208.in-addr.arpa.
All DNS requests start by asking the root servers, and they let us know what to do next.
See How Reverse DNS Lookups Work for more information.

How I am searching:
Asking e.root-servers.net for 178.58.101.208.in-addr.arpa PTR record:  
       e.root-servers.net says to go to figwort.arin.net. (zone: 208.in-addr.arpa.)
Asking figwort.arin.net. for 178.58.101.208.in-addr.arpa PTR record:  
       figwort.arin.net [192.42.93.32] says to go to NS2.SOFTLAYER.COM. (zone: 58.101.208.in-addr.arpa.)
Asking NS2.SOFTLAYER.COM. for 178.58.101.208.in-addr.arpa PTR record:  Reports 208.101.58.178-static.reverse.softlayer.com. [from 66.228.119.9]

Answer:
208.101.58.178 PTR record: 208.101.58.178-static.reverse.softlayer.com. [TTL 86400s] [A=None] *ERROR* There is no A record for 208.101.58.178-static.reverse.softlayer.com. (may be negatively cached).


-----Original message-----
From: Brian Cummiskey brian at hondaswap.com
Date: Wed, 01 Aug 2007 13:11:05 -0700
To: "thelist at lists.evolt.org" thelist at lists.evolt.org
Subject: [thelist] mail server problems

> Hi guys,
> 
> this might be a little offtopic, but i'm having some issues with my mail 
> on my webserver....
> 
> 
> i can't seem to send to addresses that require reverse lookups, namely 
> craigslist.
> 
> host mxi1s.craigslist.org [66.150.243.1]: 554 <unknown[208.101.58.178]>:
>     Client host rejected: rDNS/DNS validation failed. Please setup matching DNS and rDNS records:
> 
> 
> how do i set up dns and matching rdns records?
> 
> i have cpanel and am on RH enterprise if it matters.