forwarders

[Lyle Giese]

On 05/28/12 05:49, Amira Othman wrote:
> Hi all
>
> I configured bind9 on centos 5.8 server that has postfix mail server running
> on. When I added my ISP DNS ips to forwarders the mail server stopped
> sending mails and gives me DNS error
>
> requires that all mail servers must have a PTR record with a valid Reverse
> DNS entry. Currently your mail server does not fill that requirement.
>
> But I didn't change mail server configuration and its MX record points to
> one of ISP DNS as I am still using their DNS. What's wrong on my
> configuration or what's missing?
>
> I also can't nslookup my DNS server although I added reverse zone in my
> zones. Should I have PTR in registrar also or it's just in my DNS server?
>
> Regards
>
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Amira,
I am assuming you are talking about cairosource.com.

Your forwarders have nothing to do with your issues.  It looks like you 
are sending email from ip address 184.107.204.250.  This has no reverse 
lookup.  Iweb-hosting.com is the authority for this reverse lookup as 
the ip address is delegated to them.  If this is the only ip addres 
assigned to you, ask iweb-hosting to add a proper reverse lookup for 
this ip address.

Further your MX record for cairosource.com has a TTL of 300 seconds and 
the A record also has a TTL of 300 seconds for msrv.cairosource.com.  
This low TTL makes it look like you have a dynamic ip address.  Most 
RBL's require a minimium of 12 hrs and recommend 24 hour TTL on these 
two records.

Lyle Giese
LCR Computer Services, Inc.