David Greiner and Ben Richardson have been friends since they were toddlers. In 1999, while IT students in Wollongong, they started Switch IT, a consulting business.
Clients kept asking for bulk email newsletters and nothing on the market suited. In 2004 the pair built Campaign Monitor, working a few hours a day for six months on version one.
Their pricing was aimed at web designers who sent email for clients. They charged per email recipient rather than a flat monthly fee, and campaigns to up to five subscribers were free.
The company was profitable from the start and took no outside money for ten years. In 2014 Insight Venture Partners invested $250 million (A$266 million), the first funding it had taken.