Re: Comments surrounding draft-iab-dns-applications-01

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John R. Levine <johnl@xxxxxxxx> wrote:
>
> DNSBLs already set the min pretty low, e.g. 150 sec for Spamhaus. Doesn't
> really matter how low it is if you have so many entries that they force out
> the useful ones.

The really important records are the delegation chain NS records. It is
not so necessary to keep leaf records in the cache.

http://nms.csail.mit.edu/projects/dns/

> Modern spam filters don't usually look up the author domain, since it's
> usually a genuine address taken from the spam list so it's unrelated to the
> real sender.

I think it's still useful to reject mail with an unresolvable return path
domain.

Tony.
-- 
f.anthony.n.finch  <dot@xxxxxxxx>  http://dotat.at/
Lundy, Fastnet: Southwest 4 or 5, increasing 6 or 7 later. Moderate or rough,
occasionally very rough later in Fastnet. Showers. Good.
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