Re: Beating the spam filter ...

On 08/01/06 23:21, Carl Byington wrote:
You seem to have bogus reverse dns:

<snip>

You don't have an A record to match your reverse dns. Add an A record
for englishteachingkorea.com pointing to 72.232.183.2.

A simple check of the hello string of the mail server running on the 72.232.183.2 host shows that it is answering as "india.eccindustries.info".

An A RR query for the FQDN of "india.eccindustries.info" does resolve to the IP of 72.232.183.2 thus indicating to me that it is the proper FQDN for the IP address. This being the case the reverse DNS for the IP in question should resolve to that name. Any other name that you would like to point to that name should (IMHO) be a CNAME (a.k.a. Alias) from the other name to "india.eccindustries.info".

Before someone flames me, let me explain my position. I am of the school of thought (there are a few of them on this issue) that any given host has 1 (one) fully qualified domain name per IP. Sometimes the same FQDN can be used for multiple IPs. This being the case the reverse DNS records for the IP(s) should, nay, MUST resolve to this FQDN. The FQDN is what identifies this HOST as a computer connected to the internet. Once you have this identity established, you can then start CNAMEing / aliasing other names to it. I.e. you can say that "englishteachingkorea.com" is a CNAME / Alias to "india.eccindustries.info". You will also want to use either the FQDN or a CNAME / Alias there of as your MX record(s). In short, if as much as possible about your setup agrees on a name, or ultimately points back to one name and you advertise your self as this name, things are happier.

My advice, update your reverse DNS for 72.232.183.2 to resolve to "india.eccindustries.info".

As I'm doing some checks, "englishteachingkorea.com" uses "mail.eccindustries.info" as it's MX. "mail.eccindustries.info" is a CNAME to "server.eccindustries.info" which is an A record to 72.232.183.2. I would change the mail. CNAME to reference "india.eccindustries.info". I'd make similar changes to all the records, I'm not sure what you do or do not have. Incidentally make "server.eccindustries.info" be a CNAME to "india.eccindustries.info" too.

Any more questions, just ask.



Grant. . . .
.

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