Plotting your data on a world map would be kinda neat. D3.js is a good tool for that. Animate it over time for even more bonus points. :-)
Or, scrub your information from the data and post it for others to mess with.
I have several thousand entries for ssh, ssh-root, and spam abuse in my badhosts table.
I did a first take using Kartograph: https://int80k.com/ftb/
And I see now why you're not wanting to release the data: I thought this was data on your network. Good job grabbing that email address.
You wouldn't have to query every IP, you'd just have to query IPs not covered by a result range from a previous lookup.
I'd be willing to help on this; I have a whois module I wrote for another spam tool, I should be able to pretty easily adapt it for this.