> Quite easy: any dynamic netblock should be blacklisted on any list.

What kind of dumb idea is that ? Many people are stuck with dynamic IP
allocation (24 hour reset because ISP thinks that will prevent people
from keeping the link up all the time and free some ATM bandwidth) so
they shouldn't be allowed to use their own MX ? Instead of preventing
few problems which can be avoided in other ways (look below) this causes
lots of problems.

While i'm ranting, can the person who was using IP 67.64.13.165, FQDN
adsl-67-64-13-165.dsl.ltrkar.swbell.net on 15 Jul 2004 08:05:28 -0700
(who is no doubt subscribed to the mailing list) please get herself a
decent anti-virus software and stop sending stupid viruses that don't
even run on my hardware ? Thank you.

Blaz Antonic