The man who has reportedly raked in $300,000 from spam operations pleaded guilty to charges of fraud and tax evasion last friday, PC World reports.

Aptly dubbed “King of Spam” by authorities, Robert Soloway was arrested in May 2007 by the US Justice Department. He had previously been found guilty of other spam charges including one where he was fined US$7.8 million in a civil case against Microsoft, which he reportedly refused to pay.

Soloway’s sentence is set to be served on June 20. InformationWeek states that his sentence is likely to come from his mail fraud offense, email fraud, and failure to file a tax return. The three offenses are said to be punishable by up to twenty years, five years, and one year, respectively.

This prosecution is being sent out by authorities as a warning to other spammers still continuing with their illegal activities. As Assistant United States Attorney Kathryn Warma puts it, “We’ve only just begun.”