Hi!

I'm quite new to this anti-spam stuff, and the tutorial looks good, but in this tutorial, there are only the changes, and is not explained why those settings where selected, why you chose those stuff, what server load will produce, what will happen to false positives, and so on.

I'm very interested on aplying this changes, but before I think I must know what i'm doing

I mean, something similar to this.
http://slett.net/spam-filtering-for-mx/index.html

Thanks for taking the time to help us all

Regards,
Omar