barmar at alum.mit.edu
Mon May 28 14:31:42 UTC 2012
In article <mailman.886.1338202161.63724.bind-users at lists.isc.org>,
"Amira Othman" <a.othman at cairosource.com> 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.
I don't believe that changing your forwarders could have caused this.
This is the receiving server trying to do a reverse lookup of your IP,
which should involve your authoritative DNS, but forwarders only affects
> 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?
This has nothing to do with MX records, which are used for your incoming
mail. The error is happening on outgoing mail, which uses your reverse
> 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?
Your ISP needs to delegate the reverse DNS to your servers. This should
have been necessary all along.
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