I have often argued both on this blog and in live discussions that spam is a non-issue, which could be addressed by the ISP industry if it really wanted to. All the tools are there. A free software like SpamCannibal could do the job for low traffic operations. For ISPs, they could link their routers to DNS backlists and drop packets on port 25 from rogue ISP IP addresses or AS’es. Once the legitimate customer of ISP X will start complaining that their e-mail are being rejected on a massive scale and threaten to switch providers, be sure that ISP X will effectively stop hosting spam operations.

Only the political/economical willingness is missing. Right now, ISPs are just making lots of $$$ out of spam. That’s selling bandwidth after all. This is what you get when an industry focuses on short term profits rather than societal/ethical behaviour. Or customers could begin to sue their connectivity provider and ask for compensation for damage. After all, spam is costing billions of dollars each year to individuals and companies, in terms of lost time and resources. Saying that the carrier is neutral and is not responsible for carrying spam is unresponsible.
If the industry does not want to auto-regulate itself and really enforce its AUPs, one day or another governemnts will have to threaten them with fines is they continue to carry spammers on their network. So, spam issues, in the WSIS context, is just a smoke screen to divert us from real issues, ie unilateral political control on key Internet resources. But spam is a popular subject, as everyone is facing it. It makes good headlines in the popular press.