I would think blocking domains is worse than the RBL lists.
I have started using an email gateway called messagewall.
It has a number of checks included rbl lists, reverse DNS on MX records and a lot more.
Since implementing this setup our spam has become almost no existent and is no longer considered a problem. (I still get one or two a day).
I may be wrong, but a lot of spam claims to be from one domain, but isn't really. Making sure that the mail comes form where it claims to have originated is the best way.
I gave up on Spam Assassin and those types of programs because it seemed to Be a losing battle.
<snip>
From an end user perspective, I've found Mozilla's junk mail filtering to be fantastic at determining what's junk and what's not. Much better than plain SpamAssassin. Although, current SpamAssassin is supposed to be able to do Bayesian analysis, it's not nearly as user friendly as using Mozilla Mail. But for KMail's superiority in handling mailing lists, I'd have moved my home e-mail to Mozilla already.
I had found a link that described how to automate the use of SpamAssassin's Bayesian filtering, but I haven't actually tried it yet.
<off to google "spamassasin bayesian filter>
here it is:
http://spamassassin.rediris.es/doc/sa-learn.html
Regards, Tim
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