Ben Richardson and Dave Greiner were friends from toddler days. In 1999 they started their first business, Switch IT, while still IT students in Wollongong.
In 2004 they built Campaign Monitor because they needed a product for their clients while consulting paid the bills. It was aimed at web designers who sent email for clients.
The company charged per email recipient rather than a flat monthly fee, with campaigns of up to five subscribers free. It was self-funded and profitable from the start.
In 2014 Insight Venture Partners invested $250 million, the company's first outside funding.