There are several methods to block spam. Yet there are some stupid individuals (SpamHaus and the likes of them) who blacklist servers which sent spam. These stupid individuals cannot imagine that the IP of a spamming server can be shared with the IP of an innocent domain, like roua.org here. As a result, no matter where I get the webhosting, I'm spam-blacklisted sooner or later, because the real spammers move, I guess. I'm left with sending messages of removal to these idiots. This is an agression.
You have no right to mess with the mail from my domain, you don't have the right to list or blacklist anything related to my domain, IP or anything else. I am buying a (webhosting) service, and you are blocking it because you didn't learn enough in school, losers. You should wake up one morning and find your door blocked in concrete, and that's because you happen to share the floor with a fellow who has done something wrong. You should be outlawed, blacklisters. And the administrators using your blacklists are incompetent. They should lose their jobs.
Is any of you, readers, clean of spam because your admin uses blacklisting? No? Then tell the dinosaur there not to use these blacklists created by self-important losers. They have no effect other than bothering people who have nothing to do with spam. Tell the dinosaur about bayesian methods and tell him to forget about using spam block lists.
Basically, a content based adaptive method against spam is much better than any method based on features totally external to spam, like IP addresses. The best policy is to use mozilla mail, or any other mail client which has already implemented a bayesian filter.
I don't get spam at all, on my account on roua.org. Yes, really.