It's not so much that as the various providers mentioned have poorly
organized (and labelled) IP addresses, so that some static addresses
are mixed in with blocks that contain dynamic addresses (and vice
versa). Block lists like njabl tend not to be specific, blocking
groups of ip addresses whether they are static or dynamic. Probably
what happened is companies like comcast grew so big after gobbling up
so many smaller providers which all had different ip blocks which
were all organized differently. Comcast never went to the trouble to
reorganize all these diverse sets of ip addresses to standardize
their organization.
so these customers are running mail servers on dynamic IPs? With
AOL & hotmail and a lot of the big free mail sites blocking mail
from dynamic IPs, I'd assumed most businesses were forced to get
static IPs by now.
thanks for the info
Gary Steiner wrote:
I used njabl for a while, but had to stop when they increased who
they were blocking. I've got a lot of customers who are using
verizon, comcast, cablevision (optonline), to name a few, so even
though I get a lot of spam (especially from comcast) from these
sources, I can't block them.
Hi everyone,
this list is really quiet!
Is anyone using a DNS block list for dynamic IPs? Like
dynablock.njabl.org or one of the others. The spam from these
known dynamic IPs is really picking up over the last few months
and I need to start working on limiting it on a few servers.
thanks
ted
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