"Gordon Fecyk" <gordonf(_at_)pan-am(_dot_)ca> wrote:
The idea is to (ab)use rDNS, and to publish LMAP records there,
too. ...
MTAMARK does this.
Almost. MTAMARK publishes one piece of information: MTA, or not
MTA. The LMAP variants publish more information. So it would be
beneficial to publish LMAP information in rDNS.
Problem: Small ISPs and small to medium enterprises don't control rDNS.
North American ISPs are LAZY in this regard. [1] They won't use RFC 2317 and
in many cases won't bother changing PTR records for you, never mind add new
records to their rDNS zones.
If they realize that doing so would result in less work and money
spent fighting spam, they might change their behaviour.
The problem is that this is a political/marketing problem, and one
which we can't solve via technical means. We can design a perfect
anti-spam system, and it may be useless in practice, because no one
with the power to make a decision understands it, or cares.
Alan DeKok.