What are the security implications of someone
hacking a DNSBL (Real-time-spam-block-list) and changing the block list to
include (deny email from) some very large portion or all IPv4
space?
Given that a signifigant number of the spam blocking lists seem to operate
on a shoestring budget in someone's basement, how can we be assured that they
have sufficient resources to secure their systems adequatley, and monitor for
intrusion 24x7?
Unless I am missing something, this would seem to be a real handy and
centralized method for someone to interfere substantially with
the proper operation of a few thousand email servers and hold up global email
traffic for a few hours.
-BB