Rahul Vohra’s email startup is betting professionals will pay to reclaim hours lost to the inbox. Vaughn Ridley/Web Summit via Sportsfile via Getty Images When one of his co-founders, Vivek Sodera, urged him to fly to Hawaii for a business conference in 2017, Rahul Vohra hesitated. Superhuman, his A.I.-powered email startup, was still in its early days, and the trip felt like a distraction he couldn’t afford.