Real-time Blacklist (RBL) Servers are they worth using?

Hi, are Real-time Blacklist (RBL) Servers worth using, and if so what's the best once to use?
Thanks
- Cameron

I agree with Joe. Using just Spamhaus is a pretty good approach. Spamhaus is reasonably conservative about blacklisting servers, so it is less likely that you will reject legitimate servers (which can happen with some more aggressive RBLs).
Also, if you are serious about this, download and carefully follow Pterobyte's "Frontline Defense for Mac OSX Server" <http://osx.topicdesk.com/content/view/38/62/>. By implementing his tutorial, you will be fine tuning your server so that it rejects about 70% - 80% of spam before it reaching your content filter. It increases the efficiency of your setup a great deal.

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