And last month, the group added a new name to its blacklist, CyberBunker, and said spammers use the company as a host to spray junk mail across the Web.
During his arrest, the suspect told authorities he was a diplomat and "minister of telecommunications and foreign relations of the Republic of CyberBunker," police said Sunday.
Last month CyberBunker -- a Dutch company housed in a former NATO nuclear bunker -- did not take credit for the attack against Spamhaus but didn't shy away from talking about it.
"This here is the Internet community puking out Spamhaus," Sven Olaf Kamphuis of CyberBunker told CNN in March. "We've had it with the guys. ... What we see right here is the Internet puking out a cancer."
Kamphuis and other critics say that Spamhaus oversteps its bounds and has essentially destroyed innocent websites in its spam-fighting efforts.
"Spamhaus itself is a more urgent danger" than spam, Kamphuis told CNN. "Pointing at websites and saying they want it shut down and then they get it shut down without any court order. That is a significantly larger threat to internet and freedom of speech and net neutrality than anything else."
