Good paper from Suresh Ramasubramanian about "Spam in developing countries". A lot of information for African ISPs, I believe. http://www.oecd.org/dataoecd/5/47/34935342.pdf This is linked from the OECD antispam toolkit page, as part of section 8 of the antispam toolkit (Outreach). http://www.oecd.org/sti/spam/toolkit/