Re: proper dns listings for mail servers

On Tue, 9 Aug 2005 17:36:36 -0700, "Shannon Hemmes"
<shannonela@xxxxxxxxxxx> wrote:

>hi there,
>
>It's come to my attention recently that some sites are using rdns lookups
>and in some cases rejecting mail from our domain. I've inherited managing
>these systems & so am just learning the current setup.
>
>I figure we have something misconfigured in our external dns (hosted by an
>ISP). I'd like to know what the proper DNS configuration should be.
>
>Our setup:
>
>Firewall: firewall.domain.com (200.xxx.xxx.x)
>Spam filter: spam.domain.com (10.x.xx.x)
>Internal mail server (exch2k3): mail.domain.com (10.x.xx.x)
>
>Mail being sent out from our domain is routed thru the firewall:
>mail.domain.com>firewall.domain.com
>Incoming mail takes the following route: firewall>spam filter>internal mail
>
>Our ISP DNS has ptr record for our domain, that points to the firewall IP.
>They also have an mx record that points to our firewall.
>
>In looking at the message header from a message sent from our domain, shows
>the following received from path:
>Received: from mail.domain.com (firewall.domain.com [200.xxx.xxx.x])
>
>My guess is that we should have either an mx or a ptr record called
>mail.domain.com that points to the firewall IP? Would this be correct?
>Anyone care to do some explainin' to me?
>
>Thanks very much,
>
>Shannon
>

You need a ptr record for the ip address of the host that is sending
the mail.
Check your domain at www.dnsreport.com


.

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