Klaviyo Stock

The Boston company’s workforce has grown to 800, and its valuation (on paper) is now more than $9 billion.

Email is the communication medium that refuses to die. “Eventually, every technology is trumped by something new and better. And I feel that email is ready to be trumped. But by what?” wrote the venture capitalist Fred Wilson in 2007. Three years later, he updated readers that other forms of messag…

Startups are stories of feverish dreams and obsessive fears. Short of hearing it from the source, a glimpse into the inbox of a founder would be the best way to experience the travails they endure on the way to building a business. A customer finally makes a purchase, a VC invests or walks away, an…