Thanks for the offer. I can track them myself too, though - and it's unlikely to matter much. If anything's going to stop spam it's an organised approach, not reporting an IP to an ISP and have the spammer use one of the unlimited IPs to its proposal.

Stijn&Gry: "Wont to do", Dictionary.com: wont >:-(
I'm not sure if I used it right though. It's context of "habit" is stronger than I thought. I just often do it.