[Pkg-exim4-users] Reverse DNS lookups

[Andreas Metzler]

On 2006-05-27 Bill Horne <bill at horne.net> wrote:
[...]
> Here's the problem:

> 1. Sender is not in a dynamic address pool, but doesn't have a PTR 
> record assigned.
> 2. Sender has an "A" record from a secondary DNS service, which points 
> to the address in question.
> 3. I'd like to accept emails which have an "A" record that points to the 
> IP address the email is sent from.
[...]

To make sure I understand you corectly: Given a IP-address you need to
check whether a A record for this IP exists?

Afaik that is impossible without reverse DNS, because this is exactly
the service reverse DNS provides.

cu andreas
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