From that wikipedia entry:
The last known email address for Kuvayev, under his alias, was firstname.lastname@example.org.If that brings any joy for your revenge.
More on Leo Kuvayev / BadCow owned domains.
European spam wiki puts
Russian/American spammer, a spin-off or occasional partner with Alan Ralsky, Igabromiv, Lindsay and also the P/A/Y gang.
Does "OEM CD" pirated software spam, child and animal porn spam, porn payment collection, pharma/pills, phishing, and others. Does his own DNS, possibly does DNS for other spammers. Buys bulletproof hosting wherever he can get it. Noted for enormous numbers of domains (bogus registration info, of course), often rotating every three hours in the spam to avoid URIBL filters. Mails via proxies using the usual spamwares, probably off his own (leased) servers. Noted for having "fresh" peas, meaning he is very close to the botnet masters collecting new, unlisted, zombie IPs. Was part of Sun Network spamhaus on MCI, gets BP hosting in Brazil, China, Russia, etc.