Re: Welcome to the new(ish) ASRG list

On Sun, Mar 17, 2013 at 02:18:48PM -0400, Rob McEwen wrote:
> A typical default SA setup scores about 2 (or more?) points against "no
> rDNS". The fact that SA scores against "no rDNS" is common knowledge
> within the SA community.
> 
> But I don't think that SA scores any points against a message for the
> rDNS ending in a domain name that is different from the domain in the
> "from" address. If I'm wrong, then THAT score is likely something like
> "0.1"... or something negligible like that. I've followed the SA list
> for years and I've never heard of any mention of such a test in SA.

Just in case it helps, a number of years ago in a dnsop draft that
died on the order paper I made up terms for these.

The first is "existing reverse mapping", because you check to see
whether the reverse-map query gets an answer.

The second is "matching reverse mapping", because you check to see
whether the forward listing and reverse listing matches.  It seems
that not everyone knows this, but it's possible to have multiple PTRs,
and some libraries choke on them, so the matching-test is, IMO, a bad
idea.  At least at the time I worked on that draft, however, some
people thought it was important.

Best,

A

-- 
Andrew Sullivan
[email protected]