Author: Exim Mailing List Date: To: exim-users Subject: Re: [exim] dnsbls
On Fri, Mar 14, 2008 at 08:55:07AM -0500, Jerry Jorgenson wrote: > If anyone has had success in instructing ISP personnel on how have a
> reverse address correctly refer to the proper name server I would
> like to hear the method. (Giving them the page number in the DNS &
> BIND book doesn't seem to work. Even getting them to understand the
> request seems as difficult as getting a paper airplane to the moon.)
If you only need reverse DNS set up for a single IP address, the best
thing is to email the ISP and ask for a "PTR record to be set up for
the IP address you gave me of 1.2.3.4 to point to mail.example.com".
If you want your ISP to delegate reverse DNS to another DNS server out
of their control, you're going to find it very difficult to get them
to do it. The only time typically an ISP will be willing to do it is
if you are on a T1, T3 or other high-end dedicated circuit, or if you
are on business-grade DSL service where they have assigned you a /28
subnet or higher.
If the latter is what you are trying to do, ask them to "delegate reverse
DNS for 1.2.3.4/28 to ns1.example.com and ns2.example.com". The key
word to use here is "delegate reverse DNS", as opposed to the generic
term of "point reverse DNS", which could be taken as either method.
