Japan has arrested the "Godzilla of Spam," who promoted Internet gambling and dating services.

Investigators reckon Yuki Shiina, 25, sent as many as 2.2 billion spam messages using what appears to be rudimentary spamming techniques. He allegedly purchased a list of 600,000 email addresses for a pricey 100,000 ($927), earning 2m ($18,540) through a subsequent spamming campaign, security vendor Sophos reports.