John Levine wrote:
A DNSBL that blocks a single IP at a time, like the CBL and XBL, would
be unworkable. A typical v6 setup allocates a /64 to each host which
allows various sorts of clever self-configuration, but also means the
host can easily use a different IP address for every connection it
ever makes. (At one address per millisecond, it would take 500 million
years to run through a /64.)
Very well stated! I think we may say that, for any practical
concern, tracking IP addresses won't have clear advantages over
tracking registered domain names.
Rick's very detailed list provides many good hints. However,
sooner or later somebody should state some clear instructions
for running an MTA. I mean something that a company, an
association, or even a household can easily set up and maintain,
rather than an art/craft requiring arcane esoteric skills. In
particular, tracking registered domain names allows to keep
non-DNS settings unchanged through a change of connection
provider(s), which seems to me a worthwhile simplification.
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