Re: [Exim] Re: about SMTP callback.

On Fri, Nov 30, 2001, Marc MERLIN wrote:
> On Thu, Nov 29, 2001 at 08:19:06PM -0800, Claus Assmann wrote:
> > You can have this via a mechanism like dsn.rfc-ignorant.org,
> > i.e., DNS.
>
> This list is out of date by design. Also, I don't have control over it, and
> I don't know how trustworthy it is.
> If someone says "why did you reject my mail", I have exact logs to show why.
> Once the server is fixed, mail flows through again right away.

You can use DNS to store the data. No need to invent more caches.
DNS already has (individual) TTLs, and you can use the same access
mechanisms as for other DNS BL, whether local or remote.