Is this advertising a book?
This should be on amaz0n.c0m.
Banning foreign sites - No SPAM now
At my little community-oriented Internet site, I have banned almost all (the one's I could find) foreign IP addresses from Europe, Asia, South America, etc. I was getting 3 SPAM's per day to my system accounts, and now I get less than 3 SPAM's per month. I also have much fewer assauts via the network on my web server, email server, etc. This solution won't fit many of your situations, but it would fit some. Do you really care if someone in China cannot send you e-mail or browse your website? I'm sure you wouldn't care if someone in Europe could not remotely admin your Internet site.
You may send email directly to me if you would like my list of foreign IP's or an detailed description of how I do this. No marketing, just my free tech info.