Per Jessen wrote:
Marc Perkel wrote:
What I have is a database of a few thousand big domains who never send
spam. Banks, Credit Card compaines, airlines, and other big
bisunesses.
I think "big domains who never send spam" is an oxymoron. I don't think
that is a valuable criteria at all.
Once the host is verified as not being spoofed RDNS then
for example the host is *.wellsfargo.com then it's from Wells Fargo
Bank.
Nope, that's not correct. It's being sent by a Wells Fargo mail server,
that is all.
or maybe a bot, who knows.. unless you establish with some confidence
that the IP used sends ham only, you have nothing. According to arin,
wellsfargo.com has 151.151.0.0/16 at least.. probably more. You really
think you can trust 65534 hosts, so long as somebody setup the DNS
properly?
Ken
/Per Jessen, Zürich
--
Ken Anderson
Pacific.Net
