[Updated at 11:00 p.m.] Oleg Nikolaenko, a Russian man the FBI believes has been responsible for one-third of the spam in your inbox, pleaded not guilty Friday in federal court in Wisconsin.

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[Posted at 10:20 a.m.] A Russian man the FBI believes has been responsible for one-third of the spam you get in your inbox is scheduled to be arraigned in a Milwaukee, Wisconsin, court Monday.

According to court documents and FBI affidavits, researchers began tracking down the "Mega-D" spam automated botnet as a prime source of selling counterfeit goods, and the mastermind of it all is Oleg Nikolaenko.

"'Mega-D" was likely the largest botnet in the world, accounting for 32% of all spam," the court documents said. "Security researchers estimated that the botnet was capable of sending ten billion spam email messages a day.”

The documents show the scope of the counterfeit ring and the authorities' attempts to track down Nikolaenko.

A glimpse into how much Nikolaenko's operation may have made can be seen in court documents that allege that he received a payment of $459,098.47 between June 4 and December 5, 2007, resulting from e-mails for those peddling everything from advertised erectile dysfunction drugs, other counterfeit prescriptions, "herbal remedies" and even fake Rolex watches.

A break in finding the alleged mastermind was one of those watches. The path to Nikolaenko began when a seller of counterfeit Rolexes told authorities after he was arrested that he paid more than $2 million working with spammers to sell his product. He gave them information that resulted in a trail of information that led officials across several continents, to different e-mail addresses and websites and, eventually, back to Nikolaenko.

FBI agents and the Federal Trade Commission had been monitoring him since at least 2007, according to documents. That included two trips to the U.S. last year. And their big nab came when he went to Las Vegas, Nevada, for an auto show. He was arrested on November 4.

Christopher Van Wagner, Nikolaenko's lawyer, could not be reached immediately for comment. But he told the Milwaukee Journal Sentinel that so far, the charges against his client are only accusations.

"We're prepared to present a rigorous defense," he said.