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

Right.  Like SSRR and LSRR IP options, like open mail relays, that's
another useful facility spammers have poisoned.

In today's net, if you aren't willing to (which (almost?) always means
"can't afford to") use an ISP that will let you have a static address
with distinctive rDNS, you will find yourself treated like the rest of
the dynamic IPs you are lumped in with: a probable spam sender, for
values of "probable" strong enough for many sites to block out of hand.

It sucks, I agree.

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