Here is a follow up interview with Raj Kadam, CEO of Viralheat API whom we have interviewed on the Sentiment Analysis API here. In 2012, Viralheat had about 30 billion calls over all its' APIs. Viralheat just announced a new API called Human Intent API.
Email is one of the oldest mediums of communication on the Internet, and, for many companies, it's still one of the most important. Delivering email and tracking email campaigns reliably is crucial to success for countless businesses today.