I'm experimenting with a new list. Been testing it for a couple of
months. Got a radical idea.
The problem with lists like Day Old Bread which lists new domains that
spammers use is that there's a delay between when they are activated and
when they are listed. It's just too hard to get a list of new domains.
So - I'm trying the opposite approach. What I'm doing is listing
existing domains and if it's not listed then it's new. So - here's how
it works.
You query hostkarma.junkemailfilter.com
Not listed = new (new to us anyhow)
127.0.2.1 = last day
127.0.2.2 = last week
127.0.2.3 = older than a week
OK - so here's the rub. This catches 100% of all new domains. But - it
will have false positives because if an old domain has never emailed
anyone we filter for then it would also be considered new. We keep 40
days of data. So - this list might be useful as long as it was combined
with additional tests (probably spambot tests) as a score enhancer.
Let me know if you find this of interest.
